Metal Materials Corrosion during Superheater Chemical Cleaning

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.