憎水剂对钢铁表面不同涂层破损处的修复行为研究

飞机部件在组装、运输等过程中易造成表面涂层的破损划伤,一些零部件的连接形成的缝隙等都是环境介质侵蚀的通道和发生腐蚀的敏感区域。为此以环氧有机硅涂层、聚氨酯涂层、AV15涂层(国外产品)为基础,用航空零件用憎水剂(BH-102)对涂层破损划伤处进行修复,考察了修复后的涂层在中性盐雾、湿热环境中的腐蚀特性。结果表明:憎水剂在这三种涂层的破损划伤处修复都能得到具有明显憎水效果的表面膜层,可以有效抑制破损划伤处的腐蚀过程;相比憎水剂对环氧有机硅涂层、聚氨酯涂层破损处的修复来说,憎水剂对AV15涂层的修复效果(防腐蚀性能)优异是因为憎水剂与这种涂层中的成膜物和阻蚀成分产生协同作用的缘故。

Study of the Restoration Behavior of Breakage of Different Coatings on the Surface of Steel by a Hydrophobic Agent

Surface coatings of aircraft components can possibly be broken and scratched during assembly and transportation,and gap junctions of some fitting parts are channels of corrosion medium’s erosion and sensitive areas of corrosion.The restoration behaviors of the hydrophobic agent(BH-102) used in aircraft components for the breakages of three basic coatings(the epoxy silicone coating,the polyurethane coating and the AV15 coating) are investigated.Furthermore,the corrosion properties of coatings after restoration are also researched under the neutral salt spray environment and the hydrothermal environment.Results are presented that hydrophobic layer which can effectively prevent corrosion at coating breakage areas formed on the restoration areas of basic coatings.The restoration effect(anti-corrosion property) on the AV15 coating breakage is better than the other two coating-breakages by the hydrophobic agent,and that is because the hydrophobic agent can cause synergistic effect with the film formers and the inhibitor components of AV15 coating.