254SMo和TP317L不锈钢在造纸中水环境下的腐蚀行为

Corrosion Behavior of 254SMo and TP317L Stainless Steels in Papermaking Intermediate Water Environment

采用电化学测量技术并结合电镜技术研究了254SMo和TP317L不锈钢在造纸一次、二次中水环境下的腐蚀行为,为某电厂新建的采用造纸中水作为循环冷却水补充水的600 MW供热机组凝汽器的选材提供依据。结果表明:Cl-对254SMo和TP317L不锈钢在造纸中水中的点蚀均具有促进作用;相同造纸中水水质条件下,TP317L钢在造纸中水一次水中的耐蚀性能较二次水好,254SMo钢则相反;无论是在一次水还是二次水中,254SMo钢都表现出比TP317L钢更优异的耐点蚀性能。

The corrosion behavior of 254SMo and TP317L stainless steels in the primary and sec ondary water of papermaking intermediate waters was investigated with electrochemical tests and electronmicroscope （EM） technique. This aims to provide the basis for material selection of the condenser of a new 600 MW heating unit. The results show that C1 promoted the pitting corrosion of 254SMo and TP317L in papermaking intermediate waters; under the same water quality condi tion, the corrosion resistance of TP317L in primary water is better than that in secondary water, 254SMo just the reverse. Whether in primary water or secondary water, 254SMo shows much ex cellent resistance to pitting corrosion rather than TP317L.