Problem Solving Forum
June 22 - June 28, 2015
What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?
Selected Answers
From
Warren Brand of Chicago Corrosion Group on
June 29, 2015:
My understanding is that salt and stainless steel ...read more
My understanding is that salt and stainless steel do not play well, regardless of the grade of SS. I am less concerned about the cleanliness of the surface prep than the profile. Specifying a NACE 1, SP-5 or NACE 2, SP-10, is almost irrelevant due to the clean appearance of stainless anyway. We look for as deep a profile (and dense) as the selected coating will allow, and which will not damage or deform the SS. We have lined a huge amount of stainless steel with excellent results, and the few times we have had issues was when the abrasive blast was poor. (Check out my most recent blog for photos.)
From
Tom Schwerdt of Active Transportation Advocates on
June 26, 2015:
Specify the proper grade of stainless, correct wel ...read more
Specify the proper grade of stainless, correct weld procedures, et cetera so that you will not need a coating.
From
William Gusnard of Southern Company Services on
June 25, 2015:
Do an SSPC-SP 5 blast with either red ganet or alu ...read more
Do an SSPC-SP 5 blast with either red ganet or aluminum oxide to avoid cross-contamination of the stainless steel surface, thereby eliminating the potential for a galvanic corrosion cell.