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采用热浸镀铝的方法在20碳钢上分别制备了不同La含量的热浸镀铝涂层,通过高温氧化试验以及测量孔洞平均直径和形核数量随氧化时间的变化,研究了La含量对渗铝层/基体界面孔洞生长的影响规律。结果表明,渗铝层/基体界面孔洞的生长可划分为快速生长和稳定生长两阶段。在快速生长阶段,当La含量小于0.5wt%时,随La含量的增加,渗铝层/基体界面孔洞的生长速度逐渐减小;当La含量大于0.5wt%时,随La含量的增加,界面孔洞的生长速度逐渐增大。在稳定生长阶段,渗铝层/基体界面孔洞的生长速度随La含量的变化规律与热浸镀铝后合金层厚度随La含量的变化规律相吻合。分析了La含量对渗铝层/基体界面孔洞生长的影响机理。
The hot-dip aluminum coating with different content of La was prepared on 20 carbon steel by hot-dip aluminizing method. Through the high-temperature oxidation test and the measurement of the average pore diameter and nucleation number with oxidation time, Influence of porosity on the aluminized layer / matrix interface. The results show that the growth of aluminized layer / matrix interface pores can be divided into two stages of rapid growth and steady growth. When the content of La is less than 0.5wt%, the growth rate of pores at the aluminized layer / matrix interface decreases with the increase of La content. When the content of La is more than 0.5wt%, with the increase of La content, the interface Hole growth rate gradually increased. In the stable growth phase, the growth rate of aluminized layer / matrix interface with the variation of La content coincides with the variation of La content with the thickness of alloy layer after hot-dip aluminizing. The effect mechanism of La content on the hole growth at aluminized layer / matrix interface was analyzed.