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Ted Mooney, P.E. RET
Pine Beach, NJ

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Blackish surface on Aluminum T6061 after machining

2005

Dear Mr/Mrs/Ms,

I am facing problem in our Aluminum T 6061 part after machining.

There are blackish surface on some area of the machined part and under SEM-EDX, the blackish surface shown element of Magnesium.

Our normal part after machining only show element of Aluminum under SEM-EDX and no blackish was found.

What cause this and how to eliminate this problem ?

Pls help.

Many Thanks

Arwen
Machining company - Malaysia

Change your cutting fluid to one designed for aluminum and the black will very probably go away.

James Watts
- Navarre, Florida
2005

I suggest you look at the pH of your cutting fluids first.

AF Kenton
retired business owner - Hatboro, Pennsylvania
2005

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