Song Zhigang,Wang Shuhua*,Mei Shuwen,et al.The effect of tensile deformation on crack and corrosion resistance of Zn-Al-Mg coating[J].Plating & Finishing,2024,(3):44-49.[doi:10.3969/j.issn.1001-3849.2024.03.007]
拉伸应变对锌铝镁镀层裂纹及耐蚀性的影响
- Title:
- The effect of tensile deformation on crack and corrosion resistance of Zn-Al-Mg coating
- Keywords:
- tensile deformation ; Zn-Al-Mg coating ; crack ; corrosion resistance
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 锌铝镁镀层钢板作为重要的耐蚀材料，在使用过程中需要进行各种加工变形，研究变形量对镀层形貌及耐蚀性能的影响至关重要。本文以镀层重量为 275 g/m 2 的 Zn-1.6%Al-1.4%Mg 镀层钢板为研究对象，进行 10% 、 20% 的拉伸应变，扫描电镜（ SEM ）和金相（ OM ）观察镀层形貌显示裂纹宽度和密度随着拉伸应变量的增长而升高， 10% 应变试样裂纹宽度为 9.5 μ m ，而 20% 应变时裂纹宽度达到 15.4 μ m ，两者均有部分裂纹贯穿镀层达到基板，含有 MgZn 2 相更多的二元共晶相成为裂纹的起源。电化学试验和中性盐雾试验表明，随应变量增大，镀层腐蚀电流增大，腐蚀失重加大，盐雾试验出红锈时间缩短。裂纹加速了腐蚀初期电化学反应进程。
- Abstract:
- ： The Zn-Al-Mg coating steels are important materials for the corrosion protection of steel sheets. However ， the Zn-Al-Mg coatings should undergo various deformations in use ， so it is very important to study the effect of deformation on the crack and corrosion resistance of coatings. In this work ， the effect of 10% and 20% tensile deformation on the Zn-1.6%Al-1.4%Mg alloy coatings with coating weight of 275 g/m 2 was studied. Scanning electron microscopy （ SEM ） and optical microscope （ OM ） were utilized to observe the crack of the coatings. The crack width of 10% strain specimen was 9.5 μ m and that of 20% strain specimen reached 15.4 μ m ， and both of them have some cracks through the coating to the substrate. Binary eutectic phases containing more MgZn 2 became the origin of the crack. The electrochemical test and neutral salt spray test show that with the increase of strain ， the corrosion current and corrosion weight loss of the coating increased ， but the red rust time was shortened. The crack accelerates the electrochemical reaction during the initial corrosion.
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备注/Memo
收稿日期： 2025-05-05 修回日期： 2023-05-23 作者简介： 宋志岗（ 1983 ―），男，学士，高级工程师，主要从事板带产品开发及应用技术研究工作， email ： 13582947120@139.com * 通信作者： 王淑华（ 1979 ―），女，硕士，高级工程师， email ： wsh_sincere@163.com 基金项目： 河北省自然科学基金资助项目（ E2021318006 ）