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| Study on Protection Characteristics of D32 Steel with Different Metal Coatings in Ocean Low-salinity Wet-Dry Environment |
| Received:December 10, 2020 Revised:January 20, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.06.018 |
| KeyWord:low salinity wet-dry cycle metal coating D32 steel |
| Author | Institution |
| JIANG Jie |
CNPC EastChina Design Institute Co., Ltd, Qingdao , China |
| XU Tian |
CNPC EastChina Design Institute Co., Ltd, Qingdao , China |
| LIU Jing |
CNPC EastChina Design Institute Co., Ltd, Qingdao , China |
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| Abstract: |
| To explore a metal coating for metal corrosion protection in ocean low-salinity wet-dry environment, the corrosion environment with low salinity in Shengli Sea area was taken as the research object, the corrosion behavior and pitting characteristic of D32 steel with different metal coatings (Al, Mg, Cu and Zn) of the thickness of (30±1) μm was studied through electrochemical test and corrosion morphology analysis, so as to determine the best protective metal coatings. The results showed that under the condition of dry and wet cycles and low chloride ion concentration (fraction mass is 2%), the four electrodes were in activated conditions and anode controlled. The corrosion potential of the four metal coatings was Cu<Zn<Al<Mg, the corrosion current density was Zn<Cu<Mg<Al, the total corrosion rate was Al<Cu<Zn<Mg, and the pitting corrosion rate was Mg<Zn<Cu<Al. Therefore, under the research conditions in this paper, Zn plating can be used to protect D32 steel in the ocean spray area with low salinity. |
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