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topic 751

Oxidation of aluminium without electricity


1. Oxidation of aluminium without electricity.
2. Hardcoat additives or methods in speeding up anodizing process.

Thank you, your info is much valued.

Micheal Ho
- Malaysia


I have not heard of anodizing without electricity, Michael. Hardcoat additives allow you to do Type III (or what some people call "Type 2-1/2") anodizing at a higher temperature, approaching room temperature, but I don't think they speed anything up.

Sorry that no readers have joined in. But it's not not because no reader has knowledge of these subjects, so please spend a few paragraphs delimiting your questions and explaining your situation, and I am confident that the readers will be happy to try to help! Good luck.

Ted Mooney, Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey


What is the effect/consequences of 2 pieces of aluminium plate (mill) fastened together when it is subject to normal/harsh weather test. What is the state of the aluminium? Any coating required?

Sng Guan Hwa
Construction - Singapore


Hello, Sng. Aluminum is an active alloy that offers no corrosion resistance. It must be anodized, or chromate conversion coated, or conversion coated and painted / powder coated. Sometimes fastening two pieces together forms a capillary channel that will draw in water or salty water and accelerate the corrosion. Good luck, but you have to finish the aluminum.

Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

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