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| CORROSION BEHAVIOUR OF METALLIC MATERIALS IN HIGH VELOCITY SEAWATER |
| Zhu Xiangrun; Dai Mingan; Chen Zhenjin;Yang Zhaohui and Liang Caifeng (Central Iron and Steel Research Institute; Qingdao Research Institute for Marine Corrosion) |
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Abstract By using tubular test loop for corrosion in high velocity seawater, the potential and corrosion rate of some typical marine carbon steel, marine low alloy steels, 18-8 stainless steel, two copper alloys and one each aluminium alloy and titanium alloy have been measured at different flow rates of seawatrer. The corrosion rate at high velocity is several times higher than that in natural condition and has different characteristics. X-ray diffraction of the rust layer on steels indicates that majority of the rust layer is γ-FeOOH and no Fe_3O_4 is detected. The dependence on galvanic current from four couples on seawater velocity has been studied. The galvanic current in flowing seawater is several to dozens of times higher than that in static condition. When steels are coupled with a noble metal, the galvanic current does not change much with velocity of seawater. When Zn-Al-Cd is used as sacrificial anode to protect iron and steel, special attention should be paid to the effect of velocity.
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Received: 25 April 1992
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Cite this article:
Zhu Xiangrun; Dai Mingan; Chen Zhenjin;Yang Zhaohui and Liang Caifeng (Central Iron and Steel Research Institute; Qingdao Research Institute for Marine Corrosion). CORROSION BEHAVIOUR OF METALLIC MATERIALS IN HIGH VELOCITY SEAWATER. J Chin Soc Corr Pro, 1992, 12(2): 173-179.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I2/173
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