热水器水箱安全阀密封凸台腐蚀研究

Corrosion research of water heater tank safety valve seal boss

本文针对安全阀腐蚀失效问题展开研究,分析安全阀腐蚀失效的原因,得出安全阀腐蚀失效为Cl-对其进行点蚀造成。本文还对安全阀防腐结构进行优化,由原来的Hpb59-1黄铜一体加工成型后表面镀镍的安全阀改为317L不锈钢嵌入式凸台的安全阀,分别对两种结构的安全阀进行流动三氯化铁腐蚀试验,研究了两种结构下安全阀凸台的腐蚀情况。试验结果显示:采用Hpb59-1铅黄铜镀镍的凸台在5min的时候,表面镀镍层腐蚀脱落,开始对黄铜基材进行腐蚀,当时间达到3h时凸台几乎被腐蚀完;采用317L不锈钢的凸台3h下开始腐蚀,但未失效,4h时发生腐蚀失效。由此可见,采用317L不锈钢凸台嵌入式安全阀可以大幅提高安全阀的使用寿命,降低售后故障率。

In this paper, the view of safety valve corrosion failure problem was be studied, the causes of corrosion failure of the safety valve was be analyzed, concluded that the reason of the relief valve corrosion failure is Cl-1 pitting them. Also, this paper optimize the structure of the safety valve corrosion, from the original safety valve of one Hpb59-1 brass surface nickel after molding to the valve of 317 L stainless steel embedded boss, respectively for the two valve structures were flow ferric chloride corrosion test, the corrosion of the two safety valve boss structures was be studied. The results show that: Using leaded brass nickel plated Hpb59-1 at the time of 5min, convex surface of nickel plating layer corrosion loss, began to corrosion of brass substrate, the corrosion of convex platform is almost finished,when the time reach 3h; 317 L stainless steel convex platform start corrosion under 3h, but not failure, corrosion failure occurred while 4h. Thus, the use of 317 L stainless steel bosses embedded can significantly improve the life of the safety valve, reducing the failure rate.