摘要
利用光学显微镜、色差仪及盐雾试验箱研究了锌铝镁镀层在高温加热条件下,镀层组织、结构及镀层表面色差、失重量的变化规律。结果表明,加热温度在300℃以下时,镀层结构、色差未发生明显变化,失重量缓慢增长;400℃加热温度下,锌铝镁共晶组织呈现变粗、片层间距变大的趋势,色差线性上升;500℃加热温度下,共晶组织出现明显沿钢基与镀层界面扩散的现象,试样表面几乎全部腐蚀。加热温度高于300℃后,镀层色差及耐腐蚀性随温度的升高呈现不利的变化趋势。
The changes law of microstructure,structure,surface color difference and w eight loss of zinc aluminum magnesium coating under high temperature heating w ere studied by optical microscope,color difference instrument and salt spray test chamber. The results show that w hen the heating temperature is below 300 ℃,the coating structure and color difference do not change significantly,and the w eight loss increases slow ly;the eutectic structure of Zn-Al-M g show s a trend of coarsening,the lamellar spacing increases and the color difference increases linearly at the heating temperature of 400 ℃;the eutectic structure diffuses along the interface betw een steel substrate and coating,and almost all the surface of the sample is corroded at the heating temperature of 500 ℃ . When the heating temperature is higher than 300 ℃,the color difference and corrosion resistance of the coating show an adverse change trend w ith the increasing of temperature.
作者
王言峰
马德刚
李建英
韩冰
孙宏亮
王耐
姜嘉玮
Wang Yanfeng;Ma Degang;Li Jianying;Han Bing;Sun Hongliang;Wang nai;Jiang Jiawei(HBIS Group Tangsteel Company,Tangshan 063000,Hebei)
出处
《河北冶金》
2021年第8期28-30,77,共4页
Hebei Metallurgy
关键词
锌铝镁
镀层
加热制度
耐蚀性
色差
失重量
共晶组织
zinc aluminum magnesium
coating
heating system
corrosion resistance
color difference
w eight loss
eutectic structure
