Plastic degradation near sea when assembled with metal part

[gao7857]

Hi, I noticed the plastics are likely to degrade easier/quicker near sea (or in sea water) when it is in contact with metals. I feel there are some electrochemical activities going on. Can anyone help me understand this phenomenon, and is there any literature discussing it?
Thanks!
The plastic is molded before assemble with the metal part.

 

[rickfischer51]

What is the plastic? Where near the sea? North east, gulf of Mexico, or ?

Rick Fischer
Principal Engineer
Argonne National Laboratory

 

[gao7857]

Plastic can be nylon or PC, metal is tin or zinc plated iron

 

[gao7857]

It can be used in both coast or mexico, but mostly found in west coast.

 

[CoryPad]

Polyamides (nylon) can be sensitive to attack by zinc salts. You can search this site and the internet for more information.