Cspirit
Active member
Great pic, which I would like to use, please.
What needs to be understood is that there are various grades of aluminium alloys, some markedly more corrosion resistant than others. Unfortunately some manufacturers do not seem to understand this and select grades that are cheap to cast but do not resist seawater well. The 5000 series Al/Mg alloys are vastly superior to the 2000 series used for most car parts, which I am guessing your casing was made from.
Feel free to use the pic, Vyv.
Bob