替代电镀铬SiC复合镀电沉积机理综述

Electrodeposition Mechanisms of SiC Composite Coatings:A Review

利用SiC复合镀层代替硬铬电镀来改善材料的耐磨性能,可有效解决电镀硬铬所带来的严重污染问题。有关SiC复合电沉积机理研究,国内外学者提出了不同的观点。综述了最具有代表性的几种固体颗粒与金属的共沉积机理。Guglielmi模型应用最为广泛,但是该模型未考虑电吸附和电动力学方面,存在严重局限性。Celis的模型更为完整,但模型建立的过程中采用了许多限制性的前提条件。Valdes模型存在与Guglielmi模型类似的弊端,很难做出定量分析。运动轨迹模型则适用范围较窄。虽然每种机理都有其合理性和局限性,尽管颗粒的表面电荷和电解质对于复合电沉积非常重要,但实际表征手段的发展非常缓慢,导致对复合电沉积机理的理解相对缓慢,希望未来关于复合电沉积的机制发展可以综合考虑不同类型的速率控制、流动条件、颗粒特性和不同的操作变量。

The SiC composite coating is an effective method to replace the hard chromium plating,which could improve the wear resistance of materials and solve the problem of severe pollution caused by hard chromium plating.Many researchers have put forward different views on the mechanisms of electrodeposition of SiC composite coatings.The Guglielmi model is the most widely used,but this model does not consider the aspects of electrosorption and electrodynamics and has severe limitations.Celis's model is complete,but many restrictive preconditions are used in its construction.The Valdes model has similar drawbacks to the Guglielmi model,and it is not easy to analyze quantitatively.The motion trajectory model has a narrower scope of application.Each mechanism has its rationality and limitations.Although the surface charge and electrolyte of particles are essential for composite electrodeposition,the development of practical characterization means is very slow,which leads to a relatively slow understanding of the mechanism of composite electrodeposition.The co-deposition mechanism of severe solid particles and metals is reviewed in this paper,which can explain some phenomena but has a one-sidedness that cannot explain all the phenomena of composite deposition.It is hoped that future mechanistic developments on composite electrodeposition can comprehensively consider different types of rate controls,flow conditions,particle properties,and different operating variables.