加热时间对高频感应熔覆镍基合金涂层耐腐蚀性能的影响

Effect of heating time on corrosion resistance of Ni-base alloy coating prepared by high-frequency induction cladding

研究了不同加热时间对高频感应熔覆Ni45B镍基合金涂层组织和耐腐蚀性能的影响。结果表明,用高频感应熔覆的方法得到的合金涂层无裂纹存在,且加热时间较长的合金涂层组织更加均匀;在高温条件下,随着加热时间的延长,涂层和基体之间元素的扩散加剧,使得涂层中Fe元素含量增加,而Ni、Cr元素的含量相对减少;由于合金粉末中含有的Ni、Cr等元素,使得涂层的耐腐蚀性能远高于基体材料Q235A钢,而随着加热时间的延长,扩散引起涂层中Ni、Cr元素减少使得涂层的耐腐蚀性能降低。

Effect of heating time on corrosion resistance of Ni-base alloy coating prepared by high-frequency induction cladding was researched.The results show that the alloy coating has no crack , and the long time heating lead to the more uniform microstructure of the alloy coating .Under the condition of high temperature , with the prolongation of heating time , the intensive diffusion occurs between the alloy coating and matrix , which makes the content of Fe in the coating increase while the content of Ni and Cr decrease .The corrosion resistance of the alloy coating is much higher than that of the base materials of Q 235 A steel due to the presence of anti-corrosive elements of Ni and Cr in alloy powder .The longer heating time , the lower corrosion resistance of the coating due to the reduction of Ni and Cr in the alloy coating .