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 XPS Studies of the Al Alloy Surface with Zincate Treatment
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.
- 表面技術 = The Journal of the Surface Finishing Society of Japan
表面技術 = The Journal of the Surface Finishing Society of Japan 59(4), 257-264, 2008-04-01
The Surface Finishing Society of Japan