Acetic acid on alodined aluminium.

[var10]

Hi All,

"Dow Corning 730 Solvent resistant adhesive/sealant release a small amount of acetic acid during cure. This may cause corrosion on some metallic parts or substrates, especially in direct contact or when the cure is carried out in a totally enclosed configuration which would not allow cure by-products to escape."

This is from the tech sheet.

I am wondering they will be applied on alodined aluminium. Just underneath 8-32 socket head screws which are CRES steel. The acetic acid that will be released is very minor but the socket head sits inside a counter bore making the bi-products escape a lot harder.

My question - will this tiny amount affect my chromated al?

 

[Compositepro]

Just be aware that the acetic acid is a result of the sealant reacting with atmospheric moisture. In long narrow gaps not only is it slow for acetic acid to diffuse out, but for moisture to diffuse in. your sealant may not finish curing for weeks or months. The acid will affect your parts, but often not enough to worry about.

 

[kjoiner]

We used a non-corrosive RTV in the past for some small NEMA enclosures that had electronics inside them. I recall having to use it becuase regular RTV would corrode the circuity etc. I'll see if I can find out what it was.

Kyle