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Marine Atmospheric Corrosion of 40CrNi2Si2MoVA High Strength Steel

Zhang, Xiaoyun / Liu, Ming / Tang, Zhihui / Liu, Minghui / Sun, Zhihua

Outdoor exposure tests in marine atmosphere of 40CrNi2Si2MoVA high strength steel were carried out in Qingdao (on the east coast of Shandong facing the East China Sea) and Wanning (on the east coast of Hainan Island facing the South China Sea) respectively. The test samples include plate sample, samples for tensile and various stress corrosion cracking (SCC) test. The corrosion behavior of the steel was examined by means of mass loss measurement, SEM, as well as the change of mechanical property and SCC susceptibility. The results show that general corrosion occurs on the surface of 40CrNi2Si2MoVA steel, corrosion products are mainly Fe₃O₄, Fe₂O₃, γ-FeOOH and α-FeOOH; the mass losses vary at w=at^b(b<1). The steel exhibited high SCC sensitivity in marine environment with typical intergranular cracking, and the crack initiated from corrosion pits in the surface and developed inwards. Higher corrosion rate and higher SCC sensitivity were observed in Hainan rather than in Qingdao. The decrease of tensile strength is result from corrosion inducing premature fracture in a short term.

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Marine Atmospheric Corrosion of 40CrNi2Si2MoVA High Strength Steel

Zhang, Xiaoyun / Liu, Ming / Tang, Zhihui / Liu, Minghui / Sun, Zhihua

Outdoor exposure tests in marine atmosphere of 40CrNi2Si2MoVA high strength steel were carried out in Qingdao (on the east coast of Shandong facing the East China Sea) and Wanning (on the east coast of Hainan Island facing the South China Sea) respectively. The test samples include plate sample, samples for tensile and various stress corrosion cracking (SCC) test. The corrosion behavior of the steel was examined by means of mass loss measurement, SEM, as well as the change of mechanical property and SCC susceptibility. The results show that general corrosion occurs on the surface of 40CrNi2Si2MoVA steel, corrosion products are mainly Fe₃O₄, Fe₂O₃, γ-FeOOH and α-FeOOH; the mass losses vary at w=at^b(b<1). The steel exhibited high SCC sensitivity in marine environment with typical intergranular cracking, and the crack initiated from corrosion pits in the surface and developed inwards. Higher corrosion rate and higher SCC sensitivity were observed in Hainan rather than in Qingdao. The decrease of tensile strength is result from corrosion inducing premature fracture in a short term.

Marine Atmospheric Corrosion of 40CrNi2Si2MoVA High Strength Steel

Zhang, Xiaoyun / Liu, Ming / Tang, Zhihui / Liu, Minghui / Sun, Zhihua

Outdoor exposure tests in marine atmosphere of 40CrNi2Si2MoVA high strength steel were carried out in Qingdao (on the east coast of Shandong facing the East China Sea) and Wanning (on the east coast of Hainan Island facing the South China Sea) respectively. The test samples include plate sample, samples for tensile and various stress corrosion cracking (SCC) test. The corrosion behavior of the steel was examined by means of mass loss measurement, SEM, as well as the change of mechanical property and SCC susceptibility. The results show that general corrosion occurs on the surface of 40CrNi2Si2MoVA steel, corrosion products are mainly Fe₃O₄, Fe₂O₃, γ-FeOOH and α-FeOOH; the mass losses vary at w=at^b(b<1). The steel exhibited high SCC sensitivity in marine environment with typical intergranular cracking, and the crack initiated from corrosion pits in the surface and developed inwards. Higher corrosion rate and higher SCC sensitivity were observed in Hainan rather than in Qingdao. The decrease of tensile strength is result from corrosion inducing premature fracture in a short term.

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Title:

Marine Atmospheric Corrosion of 40CrNi2Si2MoVA High Strength Steel

Additional title:

Titel chinesisch

Contributors:

Zhang, Xiaoyun (author) / Liu, Ming (author) / Tang, Zhihui (author) / Liu, Minghui (author) / Sun, Zhihua (author)

Published in:

Fushi Kexue Yu Fanghu Jishu = Corrosion Science and Protection Technology ; 26 ; 413-419

Publication date:

2014

Size:

7 Seiten, Bilder, Tabellen, 15 Quellen

ISSN:

Type of media:

Article (Journal)

Type of material:

Print

Language:

Unknown

Keywords:

Korrosion , Stahl , atmosphärische Korrosion , Freibewitterung , Massenmessung , Massenverringerung , Meeresumwelt , Korrosionsnarbe , hochfester Stahl , Hochfestigkeit , Korrosionsverhalten , Zugfestigkeit , Korrosionsgeschwindigkeit , Zugspannung , Meeresatmosphäre

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