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Prevent corrosion by matching the protection system to the steel’s actual exposure and the contract documents, then keeping every member dry, raised, ventilated and able to drain from shipment through erection. Protect the prepared surface during fabrication, inspect after handling, and repair damage with a method compatible with the specified coating. Galvanized steel needs particular care: tightly nested, damp members can trap condensation and develop wet-storage stain even when the zinc coating is otherwise sound.
Start with the project requirements, not a default coating
Structural steel does not have one universally correct corrosion-protection system. The owner, architect and engineer select a system for the intended use, while the contract documents define what must be supplied, prepared, applied and inspected. The American Institute of Steel Construction (AISC) states, “Shop paint is not required unless specified by the contract documents.” That means a fabricator should not assume that every member receives shop primer, and an erector should not substitute a field-applied product for a specified system.
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Before fabrication begins, establish the conditions the steel will face and the work sequence that will expose it. Record the following in the project quality plan:
- Whether members will remain inside an enclosed, conditioned building or face exterior weather.
- Whether the site has coastal salt, industrial pollutants, persistent humidity, splash, immersion or other unusually corrosive conditions.
- Which surfaces will be inaccessible after erection and therefore require complete protection before delivery.
- The specified coating or galvanizing system, required surface preparation, dry-film or coating-thickness requirements, curing conditions and inspection hold points.
- Whether coating is required in the shop, in the field, or in both locations, and which areas must remain uncoated for welding, bolting or other connections.
- How members will be transported, stored, lifted, temporarily braced and touched up without damaging the system.
Do not turn a qualified AISC preparation recommendation into a universal rule. The 2022 AISC Code of Standard Practice discusses preparation in relation to intended use and notes that SSPC-SP 6 (commercial blast cleaning) is generally regarded as the minimum for the described interior corrosive and exterior applications. The governing specification may require a different preparation grade, profile, cleanliness standard or primer compatibility. Follow the project documents and the coating manufacturer’s written instructions when they are more specific.
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Choose protection by exposure, access and construction risk
A useful selection decision weighs five factors at the same time. A system that performs well in service can still fail if it cannot be applied, transported or repaired under the project’s conditions.
| Decision factor | Question to answer | Why it changes the protection plan |
|---|---|---|
| Exposure | Will the steel be enclosed, exterior, coastal, industrial or exposed to another project-specific corrosive condition? | The environment determines the required durability and system specification. |
| Coverage and access | Which faces, edges, holes and connections will be difficult to reach after erection? | Inaccessible areas may need complete shop protection or a different detailing approach before delivery. |
| Specification | What preparation, coating, galvanizing, thickness and inspection requirements are written into the contract? | Contract requirements control what may be applied and when. |
| Construction handling | How much lifting, stacking, welding, bolting and field modification will occur? | More handling increases the chance of scratches, impact damage and contamination. |
| Maintenance | Can the owner inspect and repair the protection during the intended service life? | A system that can be reached and maintained may be preferable to one that cannot, even when both meet initial requirements. |
AISC’s guidance supports this project-specific approach; it does not establish one best coating for all structural steel. Keep the selected system, surface-preparation standard and repair procedure together in the approved submittal so the fabricator, transporter and erector are working to the same requirements.
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Prepare steel correctly before coating or galvanizing
Remove contaminants that interfere with adhesion
Preparation is more than removing visible rust. Oils, grease, dirt, mill scale, salts, welding residue and incompatible markings can prevent a coating from bonding or can create localized corrosion beneath it. Clean and prepare the steel to the specified standard, then protect the prepared surface from recontamination before application.
For parts that will be hot-dip galvanized, the galvanizing preparation guidance cited by the Galvanizing Association of Australia (GAA) calls for removing residues and markings that interfere with adhesion. Use water-soluble markers where markings are needed, and remove welding residues. Ask the galvanizer about vent and drain details, temporary attachments and any fabrication residue that could obstruct cleaning or zinc flow.
Coordinate preparation with fabrication
Do not blast or coat a surface and then perform unplanned work that defeats the preparation. Sequence cutting, drilling, welding, edge treatment and cleaning so the final prepared surface is the one that receives the specified system. Protect areas intentionally left bare for welding or connections from overspray and accidental coating, and identify them clearly on drawings and in the shop traveler.
Control the application environment
Apply the product only within the temperature, humidity, surface-temperature and recoat limits stated by its manufacturer and the project specification. A clean surface can still fail when condensation forms during application or curing. Measure and record conditions where the quality plan requires it, and do not close up or stack members until the coating has reached the specified cure or handling condition.
Store structural steel so water cannot remain trapped
Keep bundles off the ground
During transport and on site, keep members dry and ventilated. The GAA’s official storage instruction is: “When stored on site, material should be covered where possible and raised clear of the ground on dunnage or spacers.” Use sound dunnage or spacers that support the load without creating pockets where water can sit. Keep steel away from soil, standing water, mud and clay; the GAA specifically warns against contact with unseasoned timber, mud or clay.
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Cover without sealing in moisture
A cover is useful only when it sheds rain while allowing air movement. Arrange tarpaulins or temporary shelters so water runs off the cover rather than onto the steel, and leave openings at the sides for ventilation. Do not wrap wet members tightly in impermeable film and assume they will dry. Inspect after rain, fog, snowmelt and wash-down operations, and remove accumulated water before it remains in contact with the steel.
Stack for drainage and inspection
Orient bundles and individual members so rainwater can drain. Maintain enough separation to see and reach contact points, and avoid stacking arrangements that create long, tight interfaces. Keep aisles clear for inspection and lifting equipment. If storage must continue for an extended period, rotate inspection points through the stack rather than checking only the outside members.
| Storage control | Correct practice | Failure it prevents |
|---|---|---|
| Support | Raise steel on dunnage or spacers clear of soil and standing water. | Ground moisture, mud and splash-driven corrosion. |
| Cover | Cover where possible, with an open, ventilated arrangement. | Direct wetting without trapping condensation. |
| Drainage | Orient stacks so rainwater can run out rather than pool. | Prolonged wetting at low points and interfaces. |
| Separation | Leave air gaps and avoid tight nesting, especially for new galvanized surfaces. | Moisture entrapment and restricted airflow. |
| Housekeeping | Keep storage away from unseasoned timber, mud, clay and dirty runoff. | Contamination and localized under-film attack. |
Store galvanized steel to prevent wet-storage stain
New galvanized steel can develop wet-storage stain, sometimes called white rust, when moisture remains between contacting galvanized surfaces or in other areas with restricted air circulation. The Australian Galvanizing Association (AGA) describes the visible deposit as zinc oxide and zinc hydroxide. Rain, dew, humidity, trapped runoff and condensation can trigger it after the galvanizing process as the zinc reacts with its environment.
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Two freshly galvanized faces pressed together can hold a thin film of water. If air cannot circulate, the surfaces dry slowly and the zinc’s normal reaction products accumulate. The risk is highest when bundles are placed directly on the ground, covered tightly while wet, or arranged so water enters but cannot drain.
What to do when a white or gray deposit appears
- Separate the affected members carefully and determine whether moisture is still present.
- Move the steel to a dry, ventilated location on dunnage, with gaps that permit drainage and airflow.
- Document the location, extent and appearance, and notify the responsible quality representative or engineer when the contract requires review.
- Assess whether the deposit is superficial or unusually heavy. A light deposit can be superficial, but severe deposits may require treatment under the galvanizing specification or the galvanizer’s advice.
- Do not paint over a damp, dirty or unassessed surface. Any cleaning or treatment must be compatible with the specified system and must not remove sound zinc unnecessarily.
Wet-storage stain is a storage and moisture-management issue, not proof that every galvanized member has lost its protective value. The correct response depends on the severity, the member’s service environment and the governing specification.
Protect the coating during fabrication, delivery and erection
Plan lifting and contact points
Use lifting methods that do not drag members across the ground or across sharp steel edges. Protect slings, hooks and spreader contacts where they could gouge a coated surface. Do not place freshly coated members on abrasive or contaminated supports. If temporary supports or cribbing are needed, keep them clean, stable and arranged so water can escape.
Control field modifications
Field cutting, drilling, welding and grinding expose bare steel and can deposit residue on nearby coating. Mark each modification, remove heat tint, slag and other residue as required, and restore the specified preparation and coating system before the area is released. Coordinate hot work with the coating manufacturer’s limits and the project fire-safety plan.
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Inspect at defined handoffs
Inspect at delivery, after storage, after major lifts and after final erection. At each handoff, look for scratches, impact marks, holidays, peeling, blistering, contamination, wet-storage stain, ponded water and coating applied where a connection must remain bare. Record the member identification and location of each defect so repairs can be verified rather than assumed.
- Delivery: Check for transport damage, wet bundles and evidence that covers trapped moisture.
- Storage: Verify dunnage, drainage, ventilation, stack stability and separation from soil and unseasoned timber.
- Handling: Inspect sling and bearing points, edges, holes and connection zones after lifting.
- Erection: Check field welds, bolted interfaces, temporary attachments and areas altered to fit.
- Closeout: Confirm that every accepted repair meets the specified preparation, product and thickness requirements.
Repair coating damage without creating a new failure
Repair is a specification decision, not a generic paint touch-up. First identify the original system, the substrate, the extent of damage and the exposure. Then follow the contract documents and the coating manufacturer’s instructions for preparation, compatibility, application and inspection.
Galvanized reinforcement is a specific case
The GAA repair guidance cited for damaged galvanized reinforcing steel identifies zinc-rich paint and zinc metallizing as repair approaches and provides preparation and film-thickness requirements for that reinforcement application. Those exact values must not be transferred automatically to a structural beam, column, connection or different coating system. For structural members, confirm the governing specification, the approved repair product and the required surface preparation before work starts.
A practical repair sequence
- Identify the system: Confirm whether the damaged area is hot-dip galvanized, shop-painted, field-painted or part of a duplex system.
- Define the repair boundary: Mark all visible damage and inspect adjacent coating for lifting, delamination or contamination.
- Prepare the surface: Remove loose material, corrosion products, grease and residue to the preparation standard specified for that system.
- Check conditions: Verify that the steel is dry and that temperature, humidity and recoat conditions meet the product instructions.
- Apply the approved repair: Use the specified compatible material and the required number of coats or thickness; do not substitute a convenient product without approval.
- Inspect and document: Record product, batch where required, preparation, application conditions and acceptance results.
Small areas of damage still matter at edges, welds, crevices and connection interfaces, where water can concentrate. Repair before the member is enclosed or made inaccessible, unless the engineer or coating specification expressly assigns the work to a later field operation.
Use a stage-by-stage corrosion-control plan
A written plan prevents the common gap in which the fabricator assumes the erector will repair damage and the erector assumes the coating contractor will do it. Assign one responsible party and one acceptance record for every transition.
| Stage | Required controls | Release evidence |
|---|---|---|
| Design and procurement | Exposure, access, specified system, preparation standard and shop/field responsibilities are defined. | Approved drawings, specifications and coating submittal. |
| Fabrication | Contaminants, markings and welding residues are controlled; prepared surfaces are protected. | Preparation and application records required by the project. |
| Transport | Loads are protected from wetting, abrasion and contamination; wet bundles are not sealed tightly. | Delivery inspection and damage log. |
| Site storage | Steel is raised, covered with ventilation, separated and oriented for drainage. | Routine storage inspection with photographs or checklist. |
| Erection | Lifting, temporary supports, field modifications and connection areas are controlled. | Post-erection inspection and repair list. |
| Repair and closeout | Repairs use compatible specified products and are inspected before concealment. | Accepted repair records and final turnover documentation. |
Common mistakes and how to correct them
“The steel is covered, so it is protected.”
A sealed cover over wet steel can retain condensation. Reconfigure the cover to shed water while allowing side ventilation, and dry the steel before re-covering.
“Galvanized steel cannot corrode in storage.”
Galvanizing provides durable zinc protection, but trapped moisture can produce wet-storage stain and severe deposits can require treatment. Raise, separate and ventilate new galvanized material.
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“Any zinc paint will repair a galvanized member.”
Compatibility, preparation and thickness are specification-dependent. The GAA repair values cited for galvanized reinforcing steel are not a blanket instruction for structural members. Obtain approval for the actual member and system.
“A scratch can wait until final painting.”
Delay allows water and contaminants to reach the substrate and can spread damage beneath an apparently intact film. Log the defect at the handoff where it is found and repair it at the earliest specified opportunity.
“One preparation standard fits every coating.”
Preparation depends on the intended use and specified system. Use the project requirement and manufacturer’s instructions; treat AISC’s discussion of SSPC-SP 6 as qualified guidance for the applications it describes, not as a universal prescription.
Questions to resolve before steel leaves the shop
- Is shop paint required by the contract, or is the steel intentionally uncoated for a later operation?
- Which surfaces will be unreachable after erection?
- What preparation standard, profile, primer, intermediate and finish coats are approved?
- For galvanized parts, have residues, unsuitable markings and welding debris been removed?
- How will bundles be supported, covered, ventilated and inspected during transport and site storage?
- Which person accepts coating damage repairs, and what record proves acceptance?
- Are the repair product and method compatible with the original galvanized or painted system?
What the evidence does—and does not—establish
The cited AISC, AGA and GAA guidance is strongest on project-specific coating selection, galvanized-steel preparation, storage ventilation, drainage and wet-storage stain. It does not replace the project specification, a coating manufacturer’s instructions or an engineer’s assessment of exposure. There is no universal corrosion rate, cost comparison or general coating service-life figure that can be applied to every structural-steel project. A narrowly stated AISC service-life estimate for a particular parking-garage coating system should not be treated as a general promise for structural steel.
Final field checklist
- Protection system matches the documented exposure and intended service.
- Shop and field coating responsibilities are explicit.
- Preparation standard and application conditions are recorded.
- Steel is raised clear of soil, mud, clay and standing water.
- Covers shed rain but leave ventilation paths.
- Stacks drain and do not tightly nest damp galvanized surfaces.
- Members are inspected after delivery, storage, lifting and erection.
- Field modifications are cleaned and restored to the specified system.
- Repairs use approved compatible products and methods.
- Acceptance records are complete before areas become inaccessible.
Frequently Asked Questions
How do you prevent corrosion on structural steel during storage?
Keep members raised on dunnage or spacers, cover them where possible without sealing in moisture, provide ventilation, orient stacks for drainage and keep steel away from soil, standing water, mud, clay and unseasoned timber. Inspect after delivery and weather events.
How should galvanized steel be stored to prevent white rust?
Keep new galvanized members dry, separated and well ventilated. Avoid tight nesting, trapped runoff and condensation between contacting surfaces. Raise bundles off the ground and arrange them so water can drain.
Is shop paint required on every structural-steel member?
No. AISC states that shop paint is not required unless the contract documents specify it. The required system depends on the project exposure, intended use and specification.
Can zinc-rich paint repair any damaged galvanized structural steel?
Not automatically. Zinc-rich paint is identified by the GAA as a repair method for damaged galvanized reinforcing steel, with preparation and thickness requirements for that application. Structural members require confirmation of the governing specification and product compatibility.
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