AlexxM Posted August 18, 2021 Share Posted August 18, 2021 Question to you ... today after a long time I looked back into the cargo area of my Defender and noticed strange changes on the sheet metal surface of the wheel arches. So strange shapes grow out of the sheet metal? Is this aluminum corrosion? If so, how can I get rid of it quickly? Thanks for your tips. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted August 18, 2021 Share Posted August 18, 2021 Yes it is corrosion, caused by dissimilar metals and salt water. Needs cleaning up and touching in but I doubt you'll stop it just slow it down. Mike Quote Link to comment Share on other sites More sharing options...
Lightning Posted August 19, 2021 Share Posted August 19, 2021 Are those salt crystals then? Quote Link to comment Share on other sites More sharing options...
uninformed Posted August 20, 2021 Share Posted August 20, 2021 On 8/19/2021 at 4:32 AM, miketomcat said: Yes it is corrosion, caused by dissimilar metals and salt water. Needs cleaning up and touching in but I doubt you'll stop it just slow it down. Mike Why do you say salt water? Quote Link to comment Share on other sites More sharing options...
miketomcat Posted August 20, 2021 Share Posted August 20, 2021 I think they are some kind of byproduct of aluminium corrosion. It's the same as we see in the marine environment. Mike Quote Link to comment Share on other sites More sharing options...
uninformed Posted August 20, 2021 Share Posted August 20, 2021 2 hours ago, miketomcat said: I think they are some kind of byproduct of aluminium corrosion. It's the same as we see in the marine environment. Mike Ah ok. it just seems some people think you need salt water or electrical current for corrosion or electrolysis to occur between dissimilar metals Quote Link to comment Share on other sites More sharing options...
monkie Posted August 20, 2021 Share Posted August 20, 2021 You need close contact and an electrolyte for galvonic corrosion. You have both of those on a Land Rover. The electrolyte is simply salt from the road mixed with rain water. Quote Link to comment Share on other sites More sharing options...
uninformed Posted August 20, 2021 Share Posted August 20, 2021 15 hours ago, monkie said: You need close contact and an electrolyte for galvonic corrosion. You have both of those on a Land Rover. The electrolyte is simply salt from the road mixed with rain water. I have no doubt that road salt ( I’m guessing for winter?) will increase the speed and severity of corrosion, but it happens without added salt. I’ve found it between the gal cappings and brimabright panels on the IIA tub I picked up from out west and here is a heavy mild steel base plate that has suffered it badly due to SS acorn nuts. This steel structure has no other rust or corrosion and sees only rain and tap water. Quote Link to comment Share on other sites More sharing options...
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