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Stainless Steel 316 at Marina Sea Coast Question
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Posted by: IN75

05/10/2004, 07:11:42

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I have a project on an island seashore. It is in a very harsh environment where it is very hot, high humidity and corrosive.
I use SST 316 machined parts as fixing brackets for anodized Aluminum Pipes (in direct contact).
I observed some Brown Rust Spots at the SST surface.
I want to know the following:
1- Can we consider this as a serious corrosion case.
2- What is the machining effect on SST 316? Do we need to have a polished surface if the rough machined surface may catch more corrosion.
3- Do we need to use some insulation between Aluminum and SST to avoid any galvanic corrosion, keeping in mind that size of SST bracket is very small compared to Aluminum.
4- Will the Acid Pickling and Passivationon be a helpful treatment for future jobs or do we need another coating?
5- Can we consider a guarantee (corrosion free product) of 15 years for SST 316 for such application.








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: Stainless Steel 316 at Marina Sea Coast
: Stainless Steel 316 at Marina Sea Coast -- IN75 Post Reply Top of thread Engineering Forum
Posted by: MGriffin

03/07/2009, 02:57:41

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Keep in mind that Stainless steel is corrosion resistant, not corrosion proof. the 316 SS should be sufficient, but any welded surfaces tend to accept corrosion faster.

I'm not real sure about the the treatment used, but galvanic corrosion occurs, regardless of size.

Hard to say if you could get a guarantee of 15 years without corrosion, however it should maintain integrity as long as it is not under constant saltwater contact. on land should be ok.








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