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Ted Mooney, P.E. RET
Pine Beach, NJ
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Intermittent Pitting After HAE Magnesium Anodise
March 18, 2010
Hello.
We have machined AMS4439 castings HAE anodized at a surface treatment supplier. On occasion, the parts have hundreds, if not thousands of tiny black indications of minimal depth. The part can also have short wormlike black indications of similar depth to the black dots.
If anyone has an idea as to the root cause of this intermittent deviation, it would be greatly appreciated.
Manufacturing planner - Montreal, Quebec, Canada
Do you perform vacuum impregnation on the casting? I'm not 100% sure that is your problem, but I do know that impregnation addresses some of the problems associated with magnesium castings.
Jon Barrows, MSF, EHSSC
GOAD Company
Independence, Missouri
March 22, 2010
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