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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Effects of zincate treatment on adhesion of electroless Ni-P coating onto various aluminum alloys
Makoto HINO1, Koji MURAKAMI1, Yutaka MITOOKA1, Ken MURAOKA1, Teruto KANADANI2

1. Industrial Technology Research Institute of Okayama Prefecture,
5301 Haga, Okayama-shi, Okayama 701-1296, Japan;
2. Okayama University of Science, 1-1, Ridai-cho, Okayama-shi, Okayama 700-0005, Japan

Abstract:The effects of alloying elements on zincate treatment and adhesion of electroless Ni-P coating onto various aluminum alloy substrates were examined. Surface morphology of zinc deposits in the 1st zincate treatment and its adhesion were changed depending on the alloying element. The zinc deposits in the 2nd zincate treatment became thinly uniform, and the adhesion between aluminum alloy substrate and Ni-P coating was improved irrespective of the alloying element. XPS analysis revealed the existence of zinc on the surface of each aluminum alloy substrate after the pickling in 5% nitric acid. This zinc on the surface should be an important factor influencing the morphology of zinc deposit at the 2nd zincate treatment and its adhesion.

 

Key words: electroless Ni-P coating; aluminum alloy; zincate treatment; adhesion

ISSN 1672-7029
CN 43-1423/U

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