Corrosion and Eear Protection of 380 Cast Aluminum

[WH74]

I'm looking coatings to protect aluminum (380 cast aluminum) from wear and corrosion from chlorine bleach, ammonia, industrial cleaners, tap water, and effluent.

I have looked at electro-less nickel and the cost is on the high side, what other alternatives are there?

 

[CoryPad]

conversion coating plus polymeric topcoat

anodizing

 

[swall]

You might also consider a switch to 390 alloy, which has better wear resistance than 380, then follow Cory's suggestion for conversion coating plus topcoat.

 

[Neubaten]

If your part is not too loaded and/or under cyclic loads, and if it is not going to undergo abrassion, you can look into a hard anodizing + sealing process (MIL-A-8635 Type III)

No extra organic coatings or platings, very good corrosion resistance and durability of the coat at a reasonable cost are the advantages of this option, IMHO.

However, silicon and copper content of that particular alloy could require a previous study of the process.

 

[Neubaten]

Sorry, typo: it is not MIL-A-8635 but MIL-A-8625