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Sherlock Ohms

The Adventure of the Inexplicable Corrosion

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William K.
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The inexplicable corrosion adventure.
William K.   12/17/2011 8:35:39 AM
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This is an interesting tale. What is missing is how the problem was solved. I have seen corrosion pop up on machined parts and not had an explanation of how to prevent it from anybody in the shop. Of course, these parts were steel, not stainless, and they were black conversion coating treated. The eventual solution, which met with a lot of complaints, was to boil the parts for a few hours in clean water, with a new batch of water every hour. It seemes that some of the blackening solution had remained in some of the small tapped holes in the fixture, and was responsible for the corrosion.

For the problem with the stainless parts in the story, one fix would be to change to a non-free-machining grade and grind the parts to size. Not a cheap or easy fix, but probably quite effective.

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