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Deterioration of cathodic protection action of zinc-rich paint coatings in atmospheric exposure

机译:富锌涂料在大气中的阴极保护作用变差

摘要

Results obtained after 10 years' atmospheric exposure of steel specimens painted with six different zinc-rich paint (ZRP) compositions are presented and discussed. The paints were formulated with ethyl silicate and epoxy-polyamide binders and included different zinc dust and conductive extender contents. Experimental data refers mainly to electrochemical measurements of corrosion potential and polarization resistance. The authors propose an interpretation of the deterioration with time of the capability of the zinc particles in the paint to provide cathodic protection to the steel. In this respect, the role exercised by polarization of the ZRP coating acting as electrode and ratio of anodic to cathodic areas is discussed.
机译:介绍并讨论了用六种不同的富锌涂料(ZRP)组合物涂漆的钢试样在大气中暴露10年后获得的结果。该涂料由硅酸乙酯和环氧聚酰胺粘合剂配制而成,并包含不同的锌粉和导电增量剂。实验数据主要涉及腐蚀电位和极化电阻的电化学测量。作者提出了一种对油漆中锌颗粒为钢提供阴极保护的能力随时间恶化的解释。在这方面,讨论了ZRP涂层的极化作用(起电极作用)以及阳极与阴极面积之比所发挥的作用。

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