用电化学方法和失重法研究了一种以缓蚀剂DG1、BTA和阻垢剂PBTCA复配而成的复合缓蚀阻垢剂DG3对锡黄铜的缓蚀作用,并用鼓泡法研究了其阻垢性能.通过实验确定了最佳配方：DG1浓度为2mg/L,BTA浓度为3mg/L,PBTCA浓度为5mg/L.研究表明：这种缓蚀阻垢剂有优良的缓蚀和阻垢性能,锡黄铜在加有DG3的70°C淡水中腐蚀速度为0.0021mm/a,达到且优于国标允许的锡黄铜腐蚀速度(0.005mm/a),而且DG3对缝隙腐蚀也有良好的抑制作用.DG3的阻垢效果与PBTCA相比没有明显降低,30℃时DG3能使淡水中234.04mg/L的钙离子稳定存在,同30℃时5mg/L PBTCA的阻垢能力相当.

The performance of a new type composite corrosion and scale inhibitor for copper was investigated by weight-loss,electrochemical and bubbling methods.The new inhibitor,DG3,comprised DG1,BTA and PBTCA.The optimum concentration of every constituent was DG1 2mg/L,BTA 3mg/L and PBTCA 5mg/L.The composite inhibitor exhibited good performance of corrosion and scale inhibition in freshwater.The corrosion rate of tin brass was 0.0021mm/a in freshwater with DG3,better than the national standard (0.005mm/a).DG3 could also inhibit crevice corrosion and crevice corrosion.The performance of scale inhibition of DG3 did not reduce obviously than that of PBTCA.The stabilized concentration of Ca2+ could reach 234.04mg/L in freshwater with DG3,similar to the effect of 5mg/L PBTCA when the temperature was 30℃.