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| ANALYSIS FOR THE REASON OF CORROSION RESISTANCE |
| Dayang Liu;Kaijin Wei;Wenjun Li;Guiqiao Huang |
| 洛阳船舶材料研究所 |
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Cite this article:
Dayang Liu; Kaijin Wei; Wenjun Li; Guiqiao Huang. ANALYSIS FOR THE REASON OF CORROSION RESISTANCE. J Chin Soc Corr Pro, 2003, 23(1): 7-12 .
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Abstract Through exposure corrosion test in seawater for 16 years,the “reversion” phenomena of corrosion resistance of containing chromium low alloy steels such as 921 in Yulin and Qingdao seawater were first found in China,but the reason was not understood at home and abroad.In order to study the reason of “reversion”,several methods including metallography,SEM/EDS,bacteri a identification and chemical analysis were used for entirely investigating the r ust layer on test steels and the rust layer on 921 steel exposed in Yulin seawat er was emphasized on.The reason of corrosion resistance “reversion” of some co ntaining chromium low alloy steels in seawater has been initially found out.As t he seawater corroded for a long period,the corrosion pits deeply developed and m any small metal granules fell off substrate,that greatly contributed to corrosio n rate.“Falling off” containing chromium steels was much serious than carbon s teels and non-containing chromium steel.It is considered that the corrosion dyna mic of carbon steels and low alloy steels may change from oxygen diffusion contr ol to bacteria such as SRB corrosion control at about one year.
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Received: 05 August 2002
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