采用高压釜静态挂片试验和EPMA，XRD分析方法，模拟研究了高温炉水中Cl-对无Fe3O4膜和有膜20A碳钢的腐蚀作用。结果表明：在360±3 ℃，pH=9.40±0.10，O2<0.020 mg/L条件下，无膜试片当Cl->0.2 mg/L时，点蚀密度随Cl-浓度增大而增大；具有完整膜的试片，当Cl-浓度高达0.8 mg/L时，膜未明显溶解；对于有蚀点的成膜试片，当Cl-浓度为0.4 mg/L时，膜即开始溶解，因此Cl-的最高允许浓度应为0.2 mg/L。
The corrosion of 20A carbon steel specimens with or without surface oxide film was studied statically in simulated boiler water containing Cl－ in the autoclave at high temperature.The SEM and XRD results indicated that under 360 ± 3 ℃ ， pH=9.40± 0.10,CO20.2 mg/L for the specimens without oxide film,but not for the specimens with oxide film.The result also showed that the maximum Cl－ concentration allowance should be 0.2 mg/L.
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