Rust Formation of Hard Chrome Plated Shaft-reg
Q. We have use the rubber wood for stacking the hard chrome plated shaft.
After 5 to 6 months the shaft getting fully corroded at the contact portion
of rubber wood,but the remaining area found free from corrosion. Can I know
the reason for this corrosion? Please explain with details. Hope your
positive reply at the earliest.
A. Although Chromium is touted as having "good corrosion resistance", hard
chromium as a coating by it self is generally micro-porous. If standard hard
chromium is plated directly on a ferrous substrate and subjected to the
elements, corrosion can occur. To minimize corrosion of chromium on ferrous
alloys, stored parts should be coated in cosmoline or oiled down.
For extreme cases of corrosive environments, a base coating of nickel under
the chromium prevents corrosion.
Thank you for the question.