Painting Stainless Steel and Corrosion
Painting Stainless Steel and Corrosion
(OP)
Over the years I have seen some stainless steel part manufactures specifically state to not paint stainless steel, but I'm trying to figure out why this might be an issue? Can anyone suggest a possible mechanism or example in the literature for how paint might accelerate or be harmful to the corrosion resistant properties of stainless steel? The only thing I can really think of is that sometimes people use acidic primer and/or roughen the surface with sandpaper prior to painting and this might be detrimental to the protective oxide layer...
Any thoughts?
Any thoughts?





RE: Painting Stainless Steel and Corrosion
RE: Painting Stainless Steel and Corrosion
RE: Painting Stainless Steel and Corrosion
RE: Painting Stainless Steel and Corrosion
RE: Painting Stainless Steel and Corrosion
http://www.diva-portal.org/smash/get/diva2:566900/...
RE: Painting Stainless Steel and Corrosion
Effective coating selection, application and maintenance will provide added protection from crevice corrosion in locations susceptble thereto.
RE: Painting Stainless Steel and Corrosion
I have seen cases where only part of a SS structure was painted, there was sever crevice corrosion at the edges of the paint. I have seen a similar effect when a fully painted unit had surface damage that was not repaired. I can envision problems with paints that have high permeability or poor adhesion.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Painting Stainless Steel and Corrosion
http://ir.library.oregonstate.edu/xmlui/bitstream/...
Maui
www.EngineeringMetallurgy.com
RE: Painting Stainless Steel and Corrosion
The inspector used a paint marker.
It sure was OK.
We pulled the other one out of service and it was identical.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Painting Stainless Steel and Corrosion
RE: Painting Stainless Steel and Corrosion
RE: Painting Stainless Steel and Corrosion
It was all crevice corrosion, took a few months.
The unit was pulled because of a bearing issue.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Painting Stainless Steel and Corrosion
RE: Painting Stainless Steel and Corrosion
I work in the aerospace industry, so I have been exposed to the issue of SCC and stainless steel alloys. While I am familiar with common surface treatments used on stainless steel components such as passivation, anti-seize or anti-galling coatings like silver plating or MoS2 dry film, or wear resistant coatings like thin-dense-chrome, I cannot recall ever seeing an example of a stainless steel part being primed and painted.
SCC issues with stainless steel materials are usually addressed by selecting the appropriate alloy and heat treatment.
RE: Painting Stainless Steel and Corrosion
In a chemical plant where you are near the coast (salt fog) and have thousands of feet of 4", 6", and 8" lines handling hot chemicals that are perfectly compatible with 304L external paint is the best option. Any attempt to use alloy selection to solve the problem will at least double your metal cost.
In smaller scale applications I agree, changing the alloy is a more reliable method.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube