At dinner we all chatted about corrosion and two different way corrosion affect boats (my grandfather was a corrosion engineer which is how we got onto the topic). The first type is your everyday rust. This is where the corrosion happens simply by exposing the metal to moisture in the air. The second type we talked about is galvanic corrosion where a metal higher in the galvanic series steals electrons from a metal lower in the series. The farther apart the metals are the faster the reaction.
We then talked about various ways we could protect against corrosion.
- paint over metal to reduce the amount of moisture contacting the metal
- isolating metals that are far apart in the galvanic series
- installing sacrificial anodes to prevent important metals like a stainless steel propeller shaft from corroding when in sea water
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