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针对华北、西北等地补充水硬度、碱度高，浓缩后极易引起结垢和腐蚀的难题，开发了高硬、高碱水缓蚀阻垢剂TH-658B。采用静态阻碳酸钙垢试验、阻硫酸钙垢试验、梯度浓缩试验等研究了TH658B的性能。结果表明，相同的药剂浓度，TH-658B的碳酸钙阻垢率均高于ATMP和HEDP且TH-658B的碳酸钙和硫酸钙阻垢率均符合Q／SY126—2007要求；TH-658B可以使高硬、高碱水浓缩至钙硬总碱之和大于1500mg／L而不会导致系统结垢。此外，参照GB／T18175-2000，在TH-658B的存在下，高硬、高碱配水（〉1500mg／L）中的碳钢、不锈钢和铜的腐蚀速率分别为0．036、0．0018、0．0012mm／a，均符合GB50050—2007的要求。通过华北一电厂的现场应用，证明了TH-658B对高硬、高碱，特别是钙硬总碱之和达到1500mg／L以上的高浓缩倍率循环水系统具有良好的缓蚀和阻垢效果。

Aiming at the scaling and corrosion problem of high hardness and alkalinity water in north and northwest of China, a new type of scale and corrosion inhibitor TH-658B was developed. The performance of TH-658B was evaluated by means of scale inhibition test, gradient concentration test and rotary coupon corrosion test. The results show that the calcium carbonate scale inhibition rate of TH-658B was higher than ATMP and HEDP under the same concentration condition. The calcium carbonate and calcium sulfate scale inhibition rate of TH-658B can meet the standard requirements of Q/SY 126--2007. Gradient enrichment test results indicate that the summation of calcium hardness and total alkalinity could reach more than 1500 mg/L as TH-658B existed in water, which is much higher than the standard requirements of GBS0050- 2007. Furthermore, TH-658B has good inhibition corrosion performance for carbon steel, stainless steel and copper in high hardness and alkalinity water. The corrosion rates for carbon steel, stainless steel and copper were 0. 0356, 0. 0018 and 0. 0012 mm/a, respectively, meeting the requirements of GB 50050-2007. TH-658B has been applied to circulating cooling water of a power plant for one year. It has proved that TH-658B had good inhibition corrosion and scale performance, and it can be used in circulating cooling system in which calcium hardness and alkalinity is up to 1500 mg/L.