提高反渗透海水淡化水缓蚀性能研究

RESEARCH ON IMPROVING CORROSION INHIBITION PERFORMANCE FOR DESALINATED WATER IN REVERSE OSMOSIS PROCESS

针对某电厂海水淡化水对碳钢管道的腐蚀问题,采用静态及动态腐蚀挂片实验方法,研究了在不同流速、不同矿化条件下海水淡化水对A3碳钢的腐蚀状况。结果表明,一级海淡水经过矿化后,腐蚀速率降低,但不能达到小于0.125 mm/a的标准要求;一级海淡水作为工业用水,添加缓蚀剂可同时满足对铜、碳钢的腐蚀速率均达标;用于饮用的海水淡化水,矿化后的海水淡化水中添加硅酸钠缓蚀剂可同时满足水的矿化指标及对管材的腐蚀速率达标,是解决海淡水作为饮用水应用的一个行之有效的方法。

To solve the corrosion problem of carbon steel pipeline which convey desalinat!on water in a power plant, corrosion tests for A3 carbon steel material was conducted in different flow-rate and mineralization parameter conditions, with the static state method and dynamic method respectively. According to the test results, corrosion rate of A3 carbon steel material can be reduced but cannot achieve the standards less than 0.125 mm/a in mineralized one-stage RO product water. By adding the inhibitor, corrosion rate of A3 carbon steel and copper material both can meet the standard requirements in one-stage RO product water which used as industrial water. When desalination water acts as drinking water, the treatment method combined mineralization and adding sodium silicate inhibitor not only make the water compliance with drinking water index but also make the causticity meet the standard requirements, so it is an effective method to use desalination water as drinking water.