The Hull Truth - Boating and Fishing Forum - View Single Post - Please Explain a Garboard Drain
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Old 02-28-2019, 04:44 PM
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Originally Posted by dmartin View Post
Tony, before I retired I worked a lot with heat exchanges and cooling water systems. We at times had problems with Stainless Steel corroding in areas that could trap water next to the stainless. The problem is that if the water is trapped it becomes acidic due to the reaction with the stainless steel when oxygen is not present.

The stainless protects itself by the very thin oxidized layer on the outside. If the oxidation layer is compromised and there is no oxygen to re oxidize it. The stagnate salt water then becomes even more acidic due to some chemical reaction that occurs. I think bronze is more resistant to crevice corrosion than stainless steel. Here is a link to an article about the problem. Good luck with it.

i had the large bow eye bolt in my Albemarle 24 corrode through in this way. The bolt looked absolutely fine on both sides but it was completely corroded in the 1/2 section that went through the hull.

Last edited by dell30rb; 03-04-2019 at 10:08 AM.