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Intermittent Pitting After HAE Magnesium Anodise
March 18, 2010
Manufacturing planner - Montreal, Quebec, Canada
We have machined AMS4439 [link by ed. to spec at TechStreet] 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.
March 22, 2010
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
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