Galvanic Corrosion

[XtianAus]

There is a video on youtube of someone testing vanax and lc200n pieces of metal in salt water. The lc200n corrodes after a day and he says he thinks that is because of galvanic corrosion.

But aren't vanax and lc200n considered too similar to corrode and form a galvanic reaction?

Help me understand please.

 

[knarfeng]

There is a video on youtube of someone testing vanax and lc200n pieces of metal in salt water. The lc200n corrodes after a day and he says he thinks that is because of galvanic corrosion.

But aren't vanax and lc200n considered too similar to corrode and form a galvanic reaction?

Help me understand please.

Likeliest explanation is that the LC200N got contaminated with free iron during the coupon fabrication. But I would need to see the video, review his setup and sample prep methods. When we use a stainless steel part for aircraft construction, we fabricate it, then passivate it by dipping it in acid to dissolve any impurities which have become embedded on the surface (unless it is going to be painted). Only then are you certain of obtaining the full corrosion resistance of the alloy.

I would not expect Vanax and LC200N to form a galvanic couple.

 

[XtianAus]

Brilliant answer. Thanks