| LIU Yecheng,ZHENG Zhibin,LONG Jun,XU Zhibiao,ZHENG Kaihong,JIAO Sihai,YIN Fuxing.#$NPCorrosion Behaviour of Hot-rolled 304L Stainless Steel-A36 Carbon Steel Composite Steel Plate for Marine Environment[J],53(14):75-86 |
| #$NPCorrosion Behaviour of Hot-rolled 304L Stainless Steel-A36 Carbon Steel Composite Steel Plate for Marine Environment |
| Received:August 20, 2023 Revised:September 19, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.14.006 |
| KeyWord:metal composites stainless steel carbon steel corrosion marine environment |
| Author | Institution |
| LIU Yecheng |
School of Rail Traffic, Wuyi University, Guangdong Jiangmen , China;Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou , China |
| ZHENG Zhibin |
Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou , China |
| LONG Jun |
Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou , China;Guangdong Provincial Iron Matrix Composite Engineering Research Center, Guangzhou , China |
| XU Zhibiao |
School of Rail Traffic, Wuyi University, Guangdong Jiangmen , China |
| ZHENG Kaihong |
Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou , China;Guangdong Provincial Iron Matrix Composite Engineering Research Center, Guangzhou , China |
| JIAO Sihai |
Baoshan Iron & Steel Co., Ltd., Shanghai , China |
| YIN Fuxing |
Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou , China;Guangdong Provincial Iron Matrix Composite Engineering Research Center, Guangzhou , China |
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| Abstract: |
| Corrosion is one of the main causes of material failure. Steel components used for marine construction, such as steel supports for coastal airports, steel structures for sea-spanning bridges, offshore platforms and steel plates for island buildings, etc., cause a large amount of economic losses due to corrosion every year. The work aims to investigate the corrosion behavior and corrosion mechanism of cladding, carbon steel substrate and stainless steel-carbon steel composite interface in 304L stainless steel and A36 carbon steel hot-rolled composite steel plate in marine atmospheric environment and seawater immersion environment. Neutral salt spray test and electrochemical test were used to simulate the different marine environments. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to characterize the microstructure and local elemental distribution at the composite interface, and X-ray diffractometry (XRD) was used to characterize the composition and valence of the corrosion products. A clear elemental transition region existed at the composite interface. The combination of the two steel composite interfaces was smooth and the bonding quality was good, and rolling had no significant effect on the microstructure at the composite interfaces of the two steels. When the neutral salt spray test was carried out for 96 h, the corrosion rate of the composite interface began to exceed that of the carbon steel substrate. At the end of the test, the corrosion mass loss of the composite interface and carbon steel substrate reached 582 g/m2 and 468 g/m2, respectively, and the corrosion rate of the composite interface in the marine atmosphere was 1.24 times of that of the carbon steel substrate. In addition, a chlorine-rich layer was observed in the corrosion products on the carbon steel side of the composite interface. In electrochemical tests, the composite interface showed smaller impedance than the carbon steel substrate, which resulted in a corrosion rate of 1.13 times that of the carbon steel substrate for the composite interface in seawater immersion environment. The galvanic coupling corrosion effect was found at the composite interface, which accelerated the corrosion of A36 carbon steel. The test results of the OCP showed that carbon steel played a dominant role in the OCP of the exposed surface of the composite steel, and the OCP of the composite interface with different stainless steel-carbon steel area ratios varied less. From the SEM morphology and EDS results of the cladding and composite interface after electrochemical tests, two forms of pitting on the cladding surface could be observed, including a wide range of pitting lace cover structure and smaller individual pitting. The stainless steel at the composite interface, on the other hand, did not produce any significant pitting craters, indicating that the 304L stainless steel portion of the composite interface was protected during tests. In different marine environments, the corrosion rate of composite interface is greater than that of cladding and substrate, particularly serious in the marine atmospheric environment. Small exposure of the carbon steel part of the composite interface can lead to a serious reduction in the corrosion resistance of the material, so the composite interface should be avoided in actual engineering application. |
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