Open AccessCorrosion evolution of electric power equipment metal materials under industrial pollution environment with high heat and high humidity
Author(s) -
Xiumin Ren,
Yao Zhong,
Jianmin Hao,
Guo-rui Wu,
Q. Wang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/770/1/012078
Subject(s) - corrosion , galvanization , materials science , metallurgy , carbon steel , humidity , scanning electron microscope , chlorine , metal , composite material , physics , layer (electronics) , thermodynamics
To investigate the atmospheric corrosion characteristics of metal materials of electric equipment in the atmospheric environment with high humidity and high chlorine industrial pollution, atmospheric accelerated corrosion tests of a typical power metal Q 235 carbon steel and galvanized steel were carried out by the salt spray method. The corrosion kinetics, corrosion products, and morphology of both materials were investigated by the weight loss method, scanning electron microscopy (SEM), and X-ray diffraction (XRD). The corrosion rate of carbon steel is larger than that of galvanized steel, and both drop with time. NaHSO 3 promotes the formation of α-FeOOH in the corrosion process of carbon steel. The high-humidity and high-chlorine environment is not conducive to the formation of Fe 3 O 4 . The interaction of NaHSO 3 and NaCl promotes the generation of corrosion products, mainly NaZn 4 SO 4 (OH) 6 Cl·6H 2 O, in galvanized steel by pitting corrosion.