摘要：

从单因素、多因素和复杂水系考察了炼厂外排污水回用于循环冷却水腐蚀的影响因素,结果表明,碳钢腐蚀的主要影响因素取决于离子特性、氧化膜的形成和溶解氧的扩散等综合协同作用,其中以离子特性的影响为最大 (如 :Cl_-、Ca²⁺ 、CO₃^2- 的腐蚀性较强 )。碳钢腐蚀反应又可由以上三种主要影响因素分为三个反应控制区,而当电导率在 0 .1～ 2 .0mS/cm范围时,其水质属于腐蚀危险高发区。从而也进一步说明水质的低电导率处理,其防腐效果并不理想,相反在高电导率情况下却表现出相对较好的低腐蚀性能。

关键词: 碳钢腐蚀, 离子特性, 氧化膜, 溶解氧扩散, 电导率

Abstract:

The investigations of the corrosion under three conditions of sing le ion, multiple ions and complicatedwater system using wastewater from refinery plant as circulating cooling water have reached some conclusions.The major af fecting factors on co rrosion are the characteristics of ions, the fo rmation of coating and the diffusionrate of dissolved oxy gen.The rate of corrosion st rongly depends on the to tal ef fects of thei r cooperation and competition.And the characteristics of ions have the strongest ef fect among of the three factors, for example thecorrosions of Cl,Ca²⁺and CO₃^2-are stronger than any o ther ions.The range of conductivity in w hich the corrosionreadily occurs is 0.1 ～ 2.0 mS/cm.Under the condit ions of low conductivity, the corrosion rate of steel alway s displays higher value, contradictorily under the conditions of high conductivity

Key words: corrosion, characteristics ofions, formation of coating, diffusion rate of dissolved oxygen, conductivity

中图分类号: 

• X742