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Chinese Journal of Materials Research  2018, Vol. 32 Issue (7): 533-540    DOI: 10.11901/1005.3093.2017.642
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Effect of Sulphite Deposits on Hydrogen Embrittlement Susceptivity of Hot-dip Galvanized Steel in Marine Atmospheric Environment
Dalei ZHANG(), Yuanyuan MIAO, He JING, Xiaohui DOU, Youhai JIN
College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580, China
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Dalei ZHANG, Yuanyuan MIAO, He JING, Xiaohui DOU, Youhai JIN. Effect of Sulphite Deposits on Hydrogen Embrittlement Susceptivity of Hot-dip Galvanized Steel in Marine Atmospheric Environment. Chinese Journal of Materials Research, 2018, 32(7): 533-540.

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Abstract  

Hydrogen permeation and embitterment behavior of hot-dip galvanized steel with different amount of sulphite deposits on surface exposed to stimulant marine atmospheric environment was investigated. The hydrogen embrittlement susceptivity of the steel in this environment was assessed through measuring the hydrogen permeation current by an improved Devanathan-Stachurski cell and the elongation of the galvanized steel at break, while observing the morphology of the fractured surface. Results indicated that the hydrogen permeation current gradually increased with the increasing amount of deposits. On the other hand, it was found that hydrogen absorption was accelerated by the synergistic effect of cathodic protection and the existed damage of zinc coating induced by scratching. The adsorbed hydrogen can reduce the elongation of the steel at break. This means that sulphite can reduce the toughness of hot-dip galvanized steel, resulting in hydrogen damage.
Key words:  material failure and protection      hydrogen permeation      atmospheric corrosion      slow strain rate tensile test      hot-dip galvanized coating      hydrogen embrittlement     
Received:  30 October 2017     
ZTFLH:  TG174.41  
  TG174.3+1  
Fund: Supported by National Natural Science Foundation of China (No. 51774314), Fundamental Research Funds for the Central Universities of China (No. 16CX05011A)
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Articles by authors
Dalei ZHANG
Yuanyuan MIAO
He JING
Xiaohui DOU
Youhai JIN

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.642     OR     https://www.cjmr.org/EN/Y2018/V32/I7/533

Element C Si Mn S P Al Fe
Mass fraction/% 0.03 0.17 0.50 0.25 0.035 0.002 Bal.
Table 1  Chemical composition of steel substrate for galvanized steels
Fig.1  Schematic diagram of tensile specimen
Fig.2  Hydrogen permeation current densities chart of galvanized steel with perfect zinc coating and deposition of different amounts of Na2SO3 on surface (30℃, 80%RH)
Deposition amounts of Na2SO3 / g·cm-2 0 0.5×10-5 1.0×10-5
Maximum current density / μA·cm-2 0.300 0.699 1.091
Average current density / μA·cm-2 0.141 0.323 0.396
Table 2  Maximum and average values of hydrogen permeation current densities of galvanized steel with perfect zinc coating and deposition of different amounts of Na2SO3 on surface (30℃, 80%RH)
Fig.3  Hydrogen permeation current densities of galvanized steel with 4 mm coating defect and deposition of different amounts of Na2SO3on surface (30℃, 80%RH)
Deposition amounts of Na2SO3 / g·cm-2 0 0.5×10-5 1.0×10-5
Maximum current density / μA·cm-2 0.773 1.118 1.991
Average current density / μA·cm-2 0.323 0.471 0.480
Table 3  Maximum and average values of hydrogen permeation current densities of galvanized steel with 4 mm coating defect and deposition of different amounts of Na2SO3 on surface (30℃, 80%RH)
Fig.4  Hydrogen permeation current densities of galvanized steel with 10 mm coating defect and deposition of different amounts of Na2SO3 on surface (30℃, 80%RH)
Deposition amounts of Na2SO3 / g·cm2 0 0.5×10-5 1.0×10-5
Maximum current density / μA·cm-2 0.092 1.704 2.959
Average current density / μA·cm-2 0.052 0.686 1.567
Table 4  Maximum and average values of hydrogen permeation current density for galvanized steel with 10 mm coating defect with different amount of Na2SO3 on surface (30℃, 80%RH)
Deposition amounts of Na2SO3 / g·cm-2 0 0.5×10-5 1.0×10-5
Without defect 0.091 0.108 0.145
4 mm defect 0.130 0.128 0.193
10 mm defect 0.025 0.388 0.911
Table 5  Hydrogen permeation capacities of galvanized steel in different environmental conditions (C)
Fig.5  Stress-strain curves for galvanized steel
Type of test Tensile strength/MPa Elongation after fracture/% Change rate of elongation/%
B1 363.6 22.62 -
B2 364.1 22.18 -1.95
B3 367.2 21.71 -4.02
B4 365.0 21.15 -6.49
B5 361.4 20.91 -7.56
Table 6  Mechanical properties of galvanized steel
Fig.6  Morphologies of fracture surface of B1 sample (a) center; (b) fringe
Fig.7  Morphologies of fracture surface of B4 sample (a) center; (b) fringe
Fig.8  Morphologies of fracture surface of B5 sample (a) center; (b) fringe
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