Rust Proof Paint

[kxa]

What is the best course of action to remove the existing rust/corrosion and paint the steel so that we could get at least 15 years out of it. The environment is pretty harsh with hot moist summers and below freezing winters with snow and ice. The paint will be used on the stairs as they will be exposed to salt/calcium chloride. Also, the location is close to the ocean and has to resist salt air as well.

 

[CoryPad]

You need to remove corrosion products (abrasive blasting would be good), then you should attempt to get zinc on the surface (galvanizing). Then, use two layers of paint, with epoxy as the first layer and urethane or acrylic as the top.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[kxa]

Thanks for the reply. Do you know were I can get the spec. for the primer and the top?

 

[CoryPad]

There are several available from SSPC, such as:

SSPC-Paint 28, Water-Borne Epoxy Primer for Steel Surfaces

SSPC-Paint 36, Two-Component Weatherable Aliphatic Polyurethane Topcoat, Performance-Based

These are available at:

http://www.sspc.org/standards/scopes.html#paint

And here are some from the US Military:

MIL-P-53030A PRIMER COATING, EPOXY, WATER REDUCIBLE, LEAD AND CHROMATE FREE

MIL-PRF-85582 Primer Coatings: Epoxy, Waterborne

MIL-PRF-85285 COATING: POLYURETHANE, AIRCRAFT AND SUPPORT EQUIPMENT

MIL-DTL-64159 COATING, WATER DISPERSIBLE ALIPHATIC POLYURETHANE, CHEMICAL AGENT RESISTANT

These are available at:

http://assist.daps.dla.mil/quicksearch/

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.