Q. Qu
金属学报(英文版)
The regularities of atmospheric corrosion of A3 steel deposited with different amountof NaCl exposed to the air containing 1ppm SO2 at 80% RH and 25℃ were studied inlaboratory. NaCl can accelerate the corrosion of A3 steel obviously under such con-dition. The relationship between the weight loss of A3 steel and the amount of NaCldeposition can be well described by using a quadratic function. Fourier transform in-frared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electron microscopyand electron dispersion X-ray analysis (SEM/EDAX) were used to characterize thecorrosion products. In the absence of NaCl, FeSO4 xH2O is the dominant corro-sion products, while Fe3O4, FeSO4@ H2O, β-FeOOH and γ-FeOOH dominate in thepresence of NaCl.
关键词:
A3 steel
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null
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Q. Qu
,
C.W. Yan
,
L. Li
,
L. Zhang
,
G.H. Liu
,
C.N. Cao
金属学报(英文版)
Influence of NH4Cl on the initial atmospheric corrosion of zinc was investigated via
quartz crystal microbalance (QCM) in laboratory at 80%RH and 25℃. The results
show that NH4Cl can accelerate the initial corrosion of zinc. Mass gain increase with
the exposure time, but mass gain in the later doesn't change obviously due to the
formation of the insoluble simonkolleite on zinc surface in the presence of NH4Cl.
Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) was
used to characterize the corrosion products. Zn5Cl2(OH)8·H2O, (NH4)2ZnCl4 and
ZnO are the corrosion products on zinc. Brief discussion on the mechanisms of atmospheric corrosion of zinc in the presence of NH4Cl was introduced.
关键词:
atmospheric corrosion
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null
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