换热器表面复合涂层耐腐蚀与导热性能

Corrosion Resistance and Thermal Conductivity of Graphene Composite Coating on the Surface of Heat Exchanger

摘要:

为了提升换热器表面耐腐蚀性且不影响换热器的换热效果，以石墨烯，石墨粉末，环氧树脂等为原料，制备应用于换热器表面的耐腐蚀高导热石墨烯复合涂层。经硫酸腐蚀实验、导热实验、结合强度实验的测试，结果表明：涂层的耐腐蚀性能随石墨烯含量的增加而提升，当石墨烯质量分数达到0.06%时，涂层的腐蚀速率达到最低值0.2338mg/(cm2·h)，其耐腐蚀性能远强于304不锈钢的1.5 mg/(cm2·h)；涂层的导热性能随石墨粉含量的增加而提升，且当石墨质量分数为8%时达到最大值35.848 W/(m·K)；涂层的结合强度达到ASTM等级：5B。

Abstract:

In order to improve the surface corrosion resistance of the heat exchanger without affecting the heat transfer efficiency, graphene, graphite powder, epoxy resin, and other materials were used to prepare the composite coating of high thermal conductivity and anti-corrosion on the surface of heat exchangers. After sulfuric acid corrosion test, heat conduction test, and bonding strength test, these conclusions are drawn: The anti-corrosion of the coating increases with the increase of graphene content and its corrosion rate will reach the minimum value 0.2338mg/(cm2·h) when the graphene mass fraction is 0.06%, and its corrosion resistance is much stronger than that of 304 stainless steel, which corrosion rate is 1.5 mg/(cm2·h); the thermal conductivity increases with the increase of graphite powder content, and will reach the maximum value 35.848 W/(m·K) when the graphite mass fraction is 8%; the bonding strength of the coating reaches ASTM grade 5B.