ジンケート処理におけるアルミニウム合金表面のXPSによる検討 [in Japanese] XPS Studies of the Al Alloy Surface with Zincate Treatment [in Japanese]
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It is well known that the adhesion strength of metal plating film on Al substrate should be remarkably improved by introducing double zincate treatment as a pretreatment process for metal plating on Al. At each step of alkaline etching, desmutting, the first zincate treatment, HNO<sub>3</sub> dipping, and the second zincate treatment in the double zincate process, depth profiles and the chemical state of the surface elements were extensively measured by XPS. A set of surface structure models in the process was proposed to explain the improvement of the adhesion strength by double zincate treatment.<br>By dipping the first zincate film in HNO<sub>3</sub> solution, a granular zinc deposit of about 1 μm thickness, roughly deposited on Al passivation film at the first zincate treatment, was dissolved, and zinc nano-particles were believed to be concurrently formed in the Al passivation film of about 3nm thickness. In the second zincate treatment the nano-particles should be exposed to the second zincate solution to act as nuclei for formation of a highly uniform and thin zinc film. The zinc particles were so close to the metallic Al substrate, that Dipolar coupling such as Al<sup><i>δ</i>+</sup>…O<sup><i>δ</i>−</sup>…Zn<sup><i>δ</i>+</sup> would act to improve the adhesion strength of double zincate film on Al substrate.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 59(4), 257-264, 2008-04-01
The Surface Finishing Society of Japan