钢表面热浸镀AlZnSi合金镀层防腐蚀技术研究.docxVIP

钢表面热浸镀AlZnSi合金镀层防腐蚀技术研究 Anticorrosion Technology Research for Hotdip AlZnSi Alloy Coating on Steel Surface WANG Wenwen，YAN Biao （School of Material Science and Engineering， University of Tongji， Shanghai *****， China） Abstract： The supplementary secondary hotdip technology as an innovative technique was used to carry out anticorrosion treatment of the common steel surface，such as galvanizing，hotdip AlZnSi alloy，hotdip ZnRe and hotdip AlZnSiRe alloy.Tensile tests were performed on the hotdip treated specimens，and the microstructure and the mechanical properties of the treated samples were investigated.Moreover，the salt spray test and simulated acid rain test were carried out in laboratory conditions，and anticorrosion performance of the specimens was researched accordingly.Then the comparative analyses were made among different kinds of hotdip specimens and industrial galvanized samples.The estimated lifetime of different kinds of coatings are forecasted by comparative analysis.The result shows that the hotdip technologoy has no negative impact for the mechanical property for steels.All the coatings have positive anticorrsion performance.The performance of AlZnSi coating is excellent，and the AlZnSiRe coating is even better. Keywords： hotdip coating； AlZnSiRe alloy coating； secondardy assistant electroplating； corrosion resistance 熱浸镀涂层是一种常用的金属腐蚀防护技术，与电镀、化学镀相比，热浸镀可获得较厚的镀层.较厚的镀层作为防护涂层，其耐腐蚀性能和抗氧化性能较普通钢板有较大的提高.作为镀层产品中的主要代表产品，AlZn合金镀层兼有Zn镀层的阴极保护功能和Al镀层的耐蚀性及抗高温氧化性，性能优异的热浸镀高Al含量AlZn合金镀层日益成为镀层领域的重要研究对象.自1967年美国伯利恒公司开发出55%Al43.4%Zn1.6Si%合金（%为质量分数，下同），商业名称Galvalume的镀层产品以来，55%Al体系的镀层产品的需求不断地增加，热浸镀55%AlZnSi合金是一种优良的钢制品涂层保护材料，它的耐腐蚀性和抗高温氧化性能俱佳，且成本较低，已成为各国的研究热点. 55%AlZn合金热镀钢板是由镀层化学成分由55%Al，43.5%Zn和1.5%Si组成，是在热镀Al和热镀Zn钢板的基础上开发成功的.它既具备了镀Al钢板优良的耐大气腐蚀性、耐热抗氧化性，又具备了镀Zn钢板优良的电化学保护性，使切口及划痕不易腐蚀生锈，并且具有优秀的附着力和柔性.采用不同的基材，可以生产不同用处的板材.成本也相对较低，而且产品表面质量几乎可与电镀Zn产品媲美，因而在汽车、建筑、家电等行业得到了越来越广泛的应用.2021年已超过1 500万t，市场需求巨大. 第3期王文闻，等：钢表面热浸镀AlZnSi合金镀层防腐蚀技术研究有 色 金 属 材 料 与 工 程20