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为提高化学镀Ni-W-P合金镀层的耐腐蚀性,防止出现起泡、脱皮等现象,分析化学镀Ni-W-P合金的反应原理,观察其镀层沉积过程的表面形貌,研究其沉积机理。结果表明:在沉积初期,原子形核不均匀,且具有明显的择优倾向。同时发现原子首先还原在固-液界面处形成原子团,然后在基体表面的高能量区域优先沉积,而不是以单个原子的形式沉积于基体表面;随着反应继续进行,沉积晶粒并未明显长大,而是随着晶粒数目增加,晶粒逐渐连成片并向外扩展,直至覆盖整个基体表面,最后形成非晶态镀层。
In order to improve the corrosion resistance of electroless Ni-W-P alloy coating and prevent foaming and peeling, the reaction principle of electroless Ni-W-P alloy was analyzed, the surface morphology of Ni-W-P alloy was observed, and the deposition mechanism was studied. The results show that in the initial deposition, the atomic nucleation is not uniform, and has a clear preference. At the same time, it was found that the first reduction of atoms formed atomic groups at the solid-liquid interface and then preferentially deposited in the high energy region of the substrate surface instead of being deposited as a single atom on the surface of the substrate. As the reaction proceeded, Large, but with the increase in the number of grains, the grain gradually even into pieces and expand outward until it covers the entire surface of the substrate, and finally the formation of amorphous coating.