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    Mark Smaalders

    Above, formation of an oxide film. Corrosion of the iron begins with the escape of an electron (1) which leaves to join a nearby chloride ion. The remaining iron ion (2) combines with oxygen (3) to form ferric oxide. This coating is permeable. Below, the marine aluminum alloy corrodes in a similar manner, but the aluminum oxide forms a tough, impermeable barrier.
    • Sailing
    • Sailing Tips

    Metal corrosion, Part One

    What happens when metals corrode, first of two parts – stainless steel corrosion details Issue 19 : Jul/Aug 2001 All boats have metal fasteners and fittings, and usually some kind of metal is used for...

    Mark Smaalders
    October 6, 2026
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    Galvanic corrosion
    • Sailing
    • Sailing Tips

    Metal corrosion, Part Two

    Second of two parts: How aluminum and copper alloys behave and applying the theory to your boat Issue 20 : Sept/Oct 2001 Aluminum alloys for use on boats are generally limited to the 5000 and 6000 ser...

    Mark Smaalders
    October 2, 2026
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