Pitting corrosion of 316 stainless steel
Pitting corrosion of 316 stainless steel
(OP)
I have a 316 grade stainless steel muffler box on the water cooled exhaust system of my marine engine. The muffler box circulates hot salt water and exhaust gases from the engine to reduce combustion noise (rather like a silencer on a car). It is isolated at each end by non-metallic connectors to the exhaust system. The box has classic pitting corrosion at the bottom, particularly near the welds at each end. I have had a plate welded over the pitted perforations where sea water is leaking from the box but need to take preventative measures. Is a sacrificial anode a possibility?





RE: Pitting corrosion of 316 stainless steel
Advise the use of a ground from the stainless section to the hull. Back up with a sacrificial anode and possibly use a sacrificial mild steel spool at the first connector
Offshore Engineering&Design
RE: Pitting corrosion of 316 stainless steel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Pitting corrosion of 316 stainless steel
You might get away with using 2205. You would need an even higher alloy like AL-6XN to be real safe, but 2205 might work and not cost a fortune.
You need to make sure that there are as few welds in the bottom as possible. Make sure that the way things are shaped that NO water will stand in the bottom when the boat is off.
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Plymouth Tube
RE: Pitting corrosion of 316 stainless steel
Mark Hutton
RE: Pitting corrosion of 316 stainless steel
RE: Pitting corrosion of 316 stainless steel
ht
galvanic corrosion can increse the problem..
there are system of cathodic protection for stainless steel in seawater like the RCP system (http://
S
Corrosion Prevention & Corrosion Control