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以深圳市的低硬、低碱度水为研究对象,考察单独投加石灰或CO,/石灰联用的两种再矿化工艺对管道腐蚀的控制效果。结果表明:当单独投加石灰提高水样的pH值时,水的腐蚀性并未有明显改变,而CO2/石灰再矿化工艺控制腐蚀的效果较明显。与未矿化的出厂水相比,当再矿化后水的碱度提高到80 mg/L(以CaCo3计)时,对A3钢、镀锌钢、灰口铸铁和球墨铸铁的腐蚀速率分别降低了73.3%、70.0%、59.7%和67.9%,并且此时腐蚀产物中碳酸钙的含量超过了60%,能很好地形成碳酸钙保护膜以抑制管道腐蚀。
Taking Shenzhen low-hardness and low-alkalinity water as the research object, the effects of two remineralization processes combined with lime alone or combined with CO and lime on pipeline corrosion control were investigated. The results showed that the corrosion of water did not change obviously when adding lime alone to improve the pH value of water samples, but the effect of CO2 / lime remineralization process to control corrosion was obvious. The corrosion rates of A3 steel, galvanized steel, gray cast iron and nodular cast iron, respectively, were increased when the alkalinity of the remineralized water was increased to 80 mg / L (in terms of CaCo3) compared to unmineralized ex-factory water Decreased by 73.3%, 70.0%, 59.7% and 67.9%, and the content of calcium carbonate in the corrosion products exceeded 60% at this time, and a good protective film of calcium carbonate was formed to inhibit pipeline corrosion.