摘要
异噻唑啉酮作为杀菌灭藻剂广泛应用于工业循环冷却水系统中,配方中多用含铜盐作为稳定剂,Cu2+的存在可能造成系统管道金属的电化学腐蚀。通过静态挂片试验考察了Cu2+对碳钢、黄铜和不锈钢腐蚀的情况。研究表明,在试验浓度下,Cu2+对碳钢的腐蚀速率为32.75mg/(m2·h),对黄铜的腐蚀速率为28.03mg/(m2·h);而对不锈钢没有明显的腐蚀作用。另外,Cu2+浓度是腐蚀的关键因素,随着浓度的增加,Cu2+对金属的腐蚀速率加快,在达到峰值后,浓度增加,腐蚀速率不再增加。实际应用时,异噻唑啉酮中的铜盐在冷却水中被大大稀释,实际浓度比本试验浓度小很多,对循环冷却水系统中管道腐蚀的影响基本可以忽略。
Static coupon tests were carried out to investigate the effect of Cu2+ on the corrosion behavior of carbon steel,brass,and stainless steel.The results showed that within the selected range of concentration of Cu2+,the carbon steel and brass recorded a corrosion rate of 0.033 g/(m2·h) and 0.028 g/(m2·h),respectively,while no obvious signs of corrosion were visible for the stainless steel.Moreover,the corrosion rates of the metals increased with increasing concentration of Cu2+ but kept almost unchanged after reaching the maximum.Fortunately,owing to the considerable dilution of the copper salts contained in isothiazolone by the cooling water in the recycled water-cooling system,the actual concentration of the copper salts would be much lower than that tested in the present research.Therefore,the influence of the copper salts contained in isothiazolone on the corrosion of the metallic pipelines used in the recycled water-cooling system could be neglected in engineering practice.
出处
《材料保护》
CAS
CSCD
北大核心
2008年第1期56-58,共3页
Materials Protection
