锌铝涂镀涂料在变压器散热器上的应用及耐蚀性能研究

Study on Application and Corrosion Resistance of Zinc-Aluminum Composite Coating for Transformer Radiator

电力设施优良的耐腐蚀性是电力系统可靠长期运行的重要保障因素之一。变压器片式散热器及所属部件是易发生腐蚀的薄弱环节,需要更高耐蚀性能的防护技术。以片状锌、铝粉为主要填料、改性环氧树脂为成膜物,开发出室温固化的锌铝涂镀涂料,并对其涂层基本性能、电化学性能以及中性盐雾性能进行研究,并与热镀锌层进行对比。结果表明:锌铝涂镀涂料制备简单,施工方便,可喷涂刷涂;涂层电极电位-985 mV,可对基体进行牺牲阳极的保护作用;08Al钢板上,涂层结合力为11.78 MPa,中性盐雾实验1000 h无红锈(涂层厚度40μm),表现出超过热镀锌的防护效果。该涂料具备用于变压器散热器片的应用前景。

Excellent corrosion resistance of power facilities is one of the important guarantee factors for reliable long-term operation of power system.The chip radiator and its components are vulnerable to corrosion,so it needs protection technology with higher corrosion resistance.In this paper,a room temperature curable zinc aluminum composite coating was developed with flake zinc and flake aluminum as main fillers and modified epoxy resin as film-forming materials.The basic properties,electrochemical properties and neutral salt spray properties of the coating were studied and compared with hot-dip zinc coating.The results showed that,the zinc aluminum coating was easy to prepare,convenient to apply,and could be sprayed and brushed;the electrode potential of the coating was-985 mV,which could protect the substrate as sacrificial function;On 08Al steel plate,the adhesion of the coating was 11.78 MPa,and there was no red rust(coating thickness was 40μm)after neutral salt spray test for 1000 h,showing the better protective performance than that of hot dip galvanizing.So,it can be regarded as a new technology for the application of transformer radiator.