Letter 7026

EN on Aluminum questions 

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Has anyone used EN in conjunction with Aluminum??? What would be the major difficulties?? I have a situation where it is being used with some real thermal expansion problems..Can anyone shed some light on this for me??

John Bettiga
- Corpus Christi, Tx USA

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The process involves cleaning, etching, desmuting, double zincate, high PH EN and then regular EN. If you do all these you will not have any problems. It is a well known process.

 
Sara Michaeli
    chemical process supplier
Israel

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I AGREE WITH THE OPINION OF SARA, BUT I THINK THAT THERE IS ONE MORE THING TO ADD. ABOVE 300 DEG CENT. ELECTROLESS WILL BEGIN TO CRISTALIZE AND HARDEN SO THE PART DESIGN AND THE PLATE THICKESS HAS TO BE REVIEWED CAREFULLY TO AVOID DEEP LARGE CRACKS OR SPALLS.

Guillermo Marrufo
Monterrey, NL, Mexico

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