中性盐雾条件下典型铝合金基底层腐蚀行为研究  

Research on Corrosion Behavior of Typical Aluminum Alloy Bottom Layer in Neutral Salt Spray Environment

作　　者：钱建才[1,2,3] 许斌 邹洪庆[1,2,3] 吴厚昌 QIAN Jian-cai;XU Bin;ZOU Hong-qing;WU Hou-chang(Southwest Research Institute of Technology and Engineering,Chongqing 400039,China;China Weathering Test and Research Center of Science Technology and Industry for National Defense,Chongqing 400039,China;Wanning Hainan,Materials Corrosion in Atmospheric Environment,National Observation&Research Station,Wanning 571522,China)

机构地区：[1]西南技术工程研究所,重庆400039 [2]国防科技工业自然环境试验研究中心,重庆400039 [3]海南万宁大气环境材料腐蚀国家野外科学观测研究站,海南万宁571522

出　　处：《材料保护》2023年第4期74-80,共7页Materials Protection

摘　　要：为了研究中性盐雾环境条件下铝合金基底层的防护作用及腐蚀规律,以阳极氧化膜、硬质阳极氧化膜、铬化膜以及磷铬化膜4种典型铝合金基底层为研究对象,通过开展中性盐雾试验,分别对上述4种基底层与有机涂层配合使用时,在7075、2A12、6063以及5A06共4种铝合金基体材料上的耐蚀性能以及抗腐蚀扩展性能等进行试验研究,并对其腐蚀规律进行分析,并对无划痕试样的腐蚀外观、附着力以及有划痕试样的最大腐蚀宽度进行测试,获得了以4种铝合金材料为基体的6种铝合金基底层在中性盐雾试验环境下的腐蚀失效情况、附着力变化情况以及不同基底层的抗腐蚀扩展性能测试结果。结果表明:不同铝合金材料类型对基底层的耐中性盐雾性能具有重要影响;铝合金基底层的性能对提高防护体系的耐中性盐雾性能具有重要作用;封闭处理能够显著提高阳极氧化膜、硬质阳极氧化膜的耐蚀性能及与有机涂层的附着性能;附着力水平不是涂层体系耐蚀性能的决定性因素。To study the protective effect and corrosion law of aluminum alloy bottom layer in neutral salt spray environment,neutral salt spray test was conducted with the anodized film,hard anodized film,chromized film and phosphorus chromized film as the research objects,to investigate the corrosion resistance and corrosion propagation performance of these four bottom layers applied togather with organic coating on four aluminum alloy substrate materials,namely 7075,2A12,6063 and 5A06,and to analyze their corrosion laws.Furthermore,the corrosion appearance and adhesion of scratch-free specimen as well as the maximum corrosion width of the specimen with scratches were tested.And the corrosion failure,variation in adhesion and corrosion propagation resistance test results of six aluminum alloy bottom layers based on four aluminum alloy materials were obtained under neutral salt spray test environment.Results showed that different types of aluminum alloys had an important effect on the protective performance of the bottom layer under neutral salt spray environment.The performance of aluminum alloy bottom layer played an important role in improving the protective system.Sealing treatment could significantly improve the corrosion resistance of anodized film and hard anodized film and also their adhesion strength to organic coating.The adhesion strength was not a decisive factor in the corrosion resistance of the coating system.

关 键 词：铝合金 耐蚀性 盐雾试验 阳极氧化 硬质阳极氧化 铬化膜 磷铬化膜 

分 类 号：TG174.4[金属学及工艺—金属表面处理]