20#钢节能器进水管腐蚀穿孔的形成原因

Cause of Corrosion Perforation of Water Inlet Pipe of 20# Steel Energy Saver

本文针对锅炉节能器的进水管20#无缝钢管的腐蚀穿孔失效,开展了宏观分析、微观分析、理化性能检验、扫描电镜及能谱分析等。研究结果表明:20#无缝钢管内壁上侧腐蚀穿孔的主要原因是氧腐蚀和湍流腐蚀。通过此研究明确了20#无缝钢管的失效原因,为提高20#钢进水管的使用寿命,提出如下建议,应尽量除去给水中的溶解氧,调节给水PH值至合理范围(7.0~10.5),或者进水管选用耐蚀性更强的金属材料。

In this paper, macro analysis, micro analysis, physical and chemical property testing, scanning electron microscope and energy dispersive spectroscopy were carried out for corrosion perforation failure of 20# seamless steel pipe of boiler economizer. The results showed that oxygen corrosion and turbulent corrosion were the main reason for corrosion perforation on the inner wall of 20# seamless steel pipe. The failure causes of 20# seamless steel pipe were clarified, and the following suggestions were put forward to improve the service life of 20# steel inlet pipe. It is suggested that the dissolved oxygen in the water supply should be removed as much as possible, the PH value of the water supply should be adjusted to a reasonable range (7.0~10.5), and the metal materials with stronger corrosion resistance should be selected for the water inlet pipe.