摘要
目的解决钢铁表面金属涂层在热带海洋大气环境中易腐蚀损伤或失效的问题,选择对热带海洋大气环境耐腐蚀性能优良的金属涂层,提高钢铁工件的使用寿命。方法在某热带海域进行户外暴露试验,对钢铁试片电镀锌镍合金和热渗锌2种金属涂层的腐蚀规律进行研究。通过扫描电镜、X射线能谱仪、光学显微镜、划格试验等,对锌镍合金镀层和热渗锌涂层的表面形貌、化学成分、截面形貌、涂层厚度及附着力等分别进行观察与测试。结果电镀锌镍合金镀层主要发生选择性腐蚀和点蚀,在720 d内具有较好的腐蚀防护性能。热渗锌层以均匀腐蚀为主,涂层微裂纹促进了腐蚀,在90 d内基体无腐蚀,360~720 d涂层的腐蚀速率较快。结论在采用的2种金属涂层工艺中,电镀锌镍合金镀层的耐腐蚀性能远优于热渗锌涂层。相对于该热渗锌涂层,电镀锌镍合金镀层更加适合作为钢铁工件金属涂层在该海域大气环境中长期使用。
The work aims to solve high susceptibility to corrosion damage or failure of metal coatings on steel in tropicad marine atmospheric environment,and select the metal coatings with high corrosion resistance in a tropical marine atmospheric environment to improve the service life of steel parts.The outdoor exposure test was carried out in certain island reef,and the corrosion rule of electrodeposited Zn-Ni alloy and hot diffusion zinc coatings was studied.By the means of scanning electron microscope,energy diffraction spectrum(EDS),optical microscope,and adherence force tester,the surface morphology,chemical composition,section morphology,thickness and adherent force of the two coatings were observed and tested.The electrodeposited Zn-Ni alloy coating showed main corrosion form including selective corrosion and pitting corrosion,and better corrosion resistance within 720 d.Hot diffusion zinc coating showed main form of general corrosion,the micro-crack in the coating promoted corrosion rate and within 90 d,the substrate showed no corrosion,and the coating corrosion rate was faster within 360 d~720 d.Between the two kinds of metal coatings used on the steel,the electrodeposited Zn-Ni alloy coating shows much better corrosion resistance than the hot diffusion zinc coating.Compared with the hot diffusion zinc coating,the electrodeposited Zn-Ni alloy coating on steel is much better suitable for long time service in the marine atmospheric environment.
作者
郭强
白鹏英
孟庆保
赵永涛
GUO Qiang;BAI Peng-ying;MENG Qing-bao;ZHAO Yong-tao(Beijing Institute of Machinery and Equipment,Beijing 100854,China;Beijing Specialized Machinery Institute,Beijing 100143,China;Troop 92228 of PLA,Beijing 100072,China)
出处
《装备环境工程》
CAS
2023年第7期127-134,共8页
Equipment Environmental Engineering
关键词
电镀锌镍合金
热渗锌
热带海洋大气
腐蚀规律
耐腐蚀性能
electrodeposited Zn-Ni alloy
hot diffusion zinc
island reef
tropical marine atmosphere
corrosion rule
corro-sion resistance
