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Chinese Journal of Materials Research  2018, Vol. 32 Issue (8): 631-640    DOI: 10.11901/1005.3093.2017.543
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Accelerated Indoor Corrosion of Galvanized Steel in a Simulated Atmospheric Environment of Guangzhou Area
Jin WANG1, Qingdan HUANG1, Jing LIU1, Yaru ZHANG1, Chuang QIAO2, Long HAO3, Junhua DONG3(), Wei KE3
1 Electric power test and Research Institute, Guangzhou Power Supply Co. Ltd. (GZPS), Guangzhou 510410, China
2 College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
3 Environmental Corrosion Center of Materials, Institute of Metal Research,
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Jin WANG, Qingdan HUANG, Jing LIU, Yaru ZHANG, Chuang QIAO, Long HAO, Junhua DONG, Wei KE. Accelerated Indoor Corrosion of Galvanized Steel in a Simulated Atmospheric Environment of Guangzhou Area. Chinese Journal of Materials Research, 2018, 32(8): 631-640.

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Abstract  

The corrosion kinetics and corrosion product of galvanized steel, which is widely used for making power transmission tower, in a simulated atmosphere of Guangzhou area were investigated by means of wet/dry-cyclic corrosion test (CCT), scanning electron microscopy (SEM), X-ray diffractometer (XRD) and Raman spectroscopy (Raman). Results indicate that, under the present simulated conditions, the corrosion weight loss of galvanized steel after 120 cycles test by CCT is equivalent to that of the same steel exposed to the atmosphere at a designed test site at Guangzhou area for 6 months. The corrosion process of the CCT test can be divided into two stages, and the corrosion rate in the early corrosion stage is relatively higher and the corrosion product scale is thin, loose and porous with poor adhesion to the matrix. With the progress of corrosion, the corrosion rate decreases obviously, and the corrosion product scale gradually becomes thicker and compact with good adhesion to the matrix, while an inner rust layer emerges. In addition, the corrosion product of the Zn-coating consists of ZnO, Zn(OH)2, ZnCO3, ZnSO4, Zn5(OH)6(CO3)2, Zn4(OH)6SO4·xH2O, Zn5(OH)8Cl2, and Zn12(OH)15Cl3(SO4)3, however, which present rather low crystallization degree. As the corrosion process proceeds, among others, the proportion of stable phases of Zn4SO4(OH)6·xH2O and Zn5(OH)6(CO3)2 increases, while that of the unstable phase of Zn12(OH)15Cl3(SO4)3 decreases.
Key words:  materials failure and protection      electricity transmission tower      galvanized steel      hot-dip Zn coating      atmospheric corrosion      SO2      Cl-     
Received:  13 September 2017     
ZTFLH:  TG146.2  
Fund: Supported by Research Program of Corrosion Distribution and Anti-corrosion Measures of Power Transmission in Complex Atmospheric Environment of Large Coastal Cities (No. GZM2014-2-0004)
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Articles by authors
Jin WANG
Qingdan HUANG
Jing LIU
Yaru ZHANG
Chuang QIAO
Long HAO
Junhua DONG
Wei KE

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.543     OR     https://www.cjmr.org/EN/Y2018/V32/I8/631

Item SO42-/mg·L-1 Cl-/mg·L-1 pH Rainfall/mm Temperature/℃ RH/%
Value 5.66 2.01 5.77 1746 22.9 83
Table 1  Annual average analysis results of Guangzhou rainfall
Composition Deposition rate Concentration Concentrating times number Reference/Data processing method
/mg·dm-2·d-1 /mg·L-1
NaCl 0.024 16.48 5 Cl- deposition rate in Guangzhou city ,obtained from China natural environment corrosion web
Na2SO3 11.69 95.95 5 SO2 deposition rate was calculated by interpolation method, according to the relationship between the SO2 concentration in air and its deposition rate, and the SO2 concentration in Table 1 (GB/T 19292.1-2003 appendix A, Table A.1) [14]
Na2CO3 / 546.69 1 Calculated from the natural dissolved equilibrium of CO2 in water at standard atmospheric pressure
Room temperature, pH = 5.77 Obtained from the annual average analysis results of rainfall of Guangzhou environmental data
Table 2  Electrolyte composition of the indoor simulated accelerating corrosion test and the data resources
Fig.1  Thickness loss of hot-dip Zn coating in filed exposure environment
Fig.2  Thickness loss and corrosion rate of hot-dip Zn coating in simulated atmospheric environment
Fig.3  Surface and cross-sectional morphologies of corroded hot-dip Zn coating after CCT for (a), (b) 20 cycles; (c), (d) 40 cycles; (e), (f) 120 cycles, respectively
Fig.4  SEM observations of corrosion products on corroded hot-dip Zn coating. (a) corrosion product with different shapes at 10 cycles; (b) lamellar corrosion product after 60 cycles; (c) locally amplified morphology of sponge ball-like corrosion products after 60 cycles; (d) lamellar structure at corrosion pitting and cracking after 90 cycles
Fig.5  EDX characterizations of the corrosion products on galvanized steel. (a) nodular-like corrosion product; (b) filamentary-like corrosion product; (c) lamellar corrosion product
Fig.6  X-ray diffraction patterns of the corroded hot-dip Zn coating after different corrosion durations
Fig.7  Raman spectrum of the corroded hot-dip Zn coating after corrosion of 120 cycles
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