Safe and Sound : Winter/Cold Weather Survival Suit Blog#9

RE: Safe and Sound : Winter/Cold Weather Survival Suit Blog#9

Workshopshed — Tue, 02 May 2017 05:41:42 GMT

A far from ideal candidate for this kind of spray, glad to see it survived so far.

DAB — Sun, 30 Apr 2017 18:38:33 GMT

Nice update.

I would try a salt water mixture to test the boards.

I worry about human sweat soaking through the clothing to the boards.

DAB

Jan Cumps — Sat, 29 Apr 2017 18:55:59 GMT

Nice. Think I would have put female headers on the Arduino to avoid spray on the pins...

mcb1 — Sat, 29 Apr 2017 17:54:52 GMT

Water and electronics are an interesting mix.

From my observations over the years, it is not immersion in clean water that causes a problem.

High frequency circuits my have some changes due to the capacitance change.

Moisture that is trapped under or around components, usually as a result of dust build-up causes the greatest issues.

I've also seen moisture affecting the flux that was not cleaned off a commercial product cause issues, but once cleaned worked fine.

It's not until the drying out and corrosion phase that the issues come forth, and I suspect electrolysis has something to do with some aspects.

I've also seen it attack vias on the pcb corroded such that they were no longer a link between the two layers.

I suspect it was a combination of the dissimilar metals used during the process (older pcb) that caused it.

Some time ago we were repairing Japanese manufactured automotive products and they seem to have been dipped in a coating.

It was an absolute pain when it came to fixing it, but it certainly kept moisture out.

Mark