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采用失重法并结合SEM和XRD技术,研究再生水管网中Ca~(2+)浓度对碳钢腐蚀行为的影响,并对碳钢的腐蚀形貌、化学成分进行分析。结果表明,Ca~(2+)浓度对碳钢腐蚀的影响主要是通过形成碳酸钙产物,改变腐蚀层的结构成分和电化学性质,从而达到抑制或加速腐蚀的效果;随着Ca~(2+)浓度的升高,碳钢腐蚀产物中的团状和絮状的铁氧化物比例有所降低,规则砾石状的钙氧化物比例逐渐增加;低浓度Ca~(2+)对碳钢腐蚀有明显抑制作用,高浓度钙离子对腐蚀速率影响不大,钙浓度为100 mg/L运行16 d时,碳钢的腐蚀速率甚至出现上升。
The effects of Ca2 + concentration on the corrosion behavior of carbon steel in reclaimed water pipelines were investigated by weight loss method combined with SEM and XRD techniques. The corrosion morphology and chemical composition of carbon steel were also analyzed. The results show that the effect of Ca2 + concentration on the corrosion of carbon steel is mainly through the formation of calcium carbonate product, which can change the structure and electrochemical properties of the corrosion layer to achieve the effect of inhibiting or accelerating the corrosion. +) Decreased, the proportion of agglomerate and flocculent iron oxide in the corrosion products of carbon steel decreased, and the proportion of regular gravel-like calcium oxide increased gradually. The corrosion of carbon steel with low concentration of Ca 2+ The inhibitory effect was obvious. The high concentration of calcium ion had little effect on the corrosion rate. When the calcium concentration was 100 mg / L for 16 d, the corrosion rate of carbon steel even increased.