锅炉过热器进行化学清洗时, 涉及多种金属材料(如20G, T22, 15CrMoG, 12Cr1MoV, T91, TP347及Super 304等)。为了掌握清洗过程这些材料的腐蚀情况, 采用模拟清洗试验, 研究了常规清洗配方及工艺条件下这些材料的腐蚀速率。结果表明, EDTA氨盐和EDTA钠盐清洗配方对各种材料的腐蚀速率都维持在较低水平; 其他清洗介质中, T91的腐蚀速率远大于其他材料, 且采用羟基乙酸+甲酸配方清洗后奥氏体钢出现了晶间腐蚀。研究了不同缓蚀剂控制复合有机酸A中各种金属材料的腐蚀速率, 结果表明, 采用缓蚀剂配方调整可以有效地控制这些材料的腐蚀速率。

During the superheater chemical cleaning, the cleaning system involves many metal materials such as 20G, T22, 15CrMoG, 12Cr1MoV, T91, TP347, Super 304 and so on. In order to master the corrosion situation of these materials during chemical cleaning, the corrosion rates of these materials in cleaning agents were studied by simulating tests. The results showed that the corrosion rates of these materials in NH-EDTA and Na-EDTA chemical agents were all at a relatively low level, but the corrosion rate of T91was much higher than that of other materials in other chemical agents and intergranular corrosion appeared on TP347 and Super 304 in hydroxyl acetic acid + formic acid agent. The corrosion rates of all materials can be controlled at a low level in complex-organic-acid-A by adjusting the inhibitor formula.