物理化学学报2012，Vol.28Issue(5)：1153-1162,10.DOI:10.3866/PKU.WHXB201203022
锈层对海水淡化一级反渗透产水中碳钢腐蚀行为的影响
Effect of Rust Layer on the Corrosion Behavior of Carbon Steel in Reverse Osmosis Product Water
摘要
Abstract
The morphologies and electrochemical characteristics of rust layers generated in seawater and reverse osmosis (RO) product water were investigated by scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray diffraction (XRD) and electrochemical tests. Experimental results revealed obvious differences in the components, structures and functions of rust layers in two types of solutions, so that the corrosion rates of carbon steel were markedly different. The reduction potential of y-FeOOH is higher than the corrosion potential of carbon steel in RO product water, such that y-FeOOH is easily reduced to Fe3O4 and two layers emerge in the rust structures. The outer layer (y-FeOOH layer) is too thin to inhibit oxygen diffusion, and tends to accelerate the cathodic process via reduction of y-FeOOH. Because Fe2* and electrons can pass through the Fe3O4 layer, oxygen can be directly reduced on the surface of the inner layer (Fe3O4 layer). Therefore, the inner rust layer (Fe3O4 layer) can provide a large cathode area on which to promote oxygen reduction. As a result, the corrosion process of carbon steel in RO product water can be accelerated greatly. The corrosion rate of carbon steel is determined by the limiting diffusion rate of oxygen from solution to the inner rust layer. Anti-corrosion measures should inhibit the reduction reaction of y-FeOOH.关键词
锈层/海水/一级RO产水/电化学行为/腐蚀机理/防腐Key words
Rust layer/ Seawater/ RO product water/ Electrochemical behavior/ Corrosion mechanism/ Anti-corrosion分类
化学化工引用本文复制引用
胡家元,曹顺安,谢建丽..锈层对海水淡化一级反渗透产水中碳钢腐蚀行为的影响[J].物理化学学报,2012,28(5):1153-1162,10.基金项目
中央高校基本科研业务费专项(20102080101000090)资助项目 （20102080101000090）
