热处理对Ni-P镀层耐硫酸露点腐蚀性能的影响

发布时间：2018-06-10 03:12

  本文选题：Ni-P镀层 + 热处理　； 参考：《金属热处理》2017年02期

【摘要】：在20R钢表面化学镀Ni-P合金镀层,结果表明:制备的镀层表面平整致密无裂纹,P含量为10.72%,属于高磷非晶镀层。对镀层热处理后的结构、表面形貌、结合强度等性能进行了测试分析,发现Ni-P镀层经200℃热处理后仍保持非晶态结构并且结合强度更好,升温至300℃后开始析出Ni_3P相,镀层转化为混晶态结构。采用电化学试验方法研究经200℃热处理后Ni-P镀层及常用钢材20R、ND钢和316L不锈钢的耐蚀性,发现Ni-P镀层相对于20R、ND钢和316L不锈钢在5%硫酸溶液中的自腐蚀电位更高,为-234 m V,自腐蚀电流密度更小,为3.8687×10~(-6)A·cm~(-2),电荷转移电阻更大,为954.9Ω·cm~(-2),体现了更好的抗硫酸腐蚀性能;对四种材质在60℃不同浓度硫酸溶液中进行实验室均匀腐蚀试验,它们的年腐蚀率排序为20R?ND?Ni-P316L。
[Abstract]:Electroless Ni-P alloy coating was deposited on 20R steel. The results show that the surface of the prepared coating is flat, compact and crack-free, and the content of P is 10.72, which belongs to the amorphous coating with high phosphorus content. The structure, surface morphology and bonding strength of Ni-P coating after heat treatment were tested and analyzed. It was found that Ni-P coating remained amorphous structure after heat treatment at 200 鈩，

本文编号：2001778