Study on Corrosion Properties of New Material for Slurry Pump
TAN Fei1, NING Zhaoxiang2, XU Xiaochang1, REN Penghe1, CHEN Guangxing1
1 School of Materials Science and Engineering, Central South University, Changsha 410083 2 Jishou Changtan Pump Industry Company Limited (Ltd), Jishou 416000
Abstract: A new type of wear-resistant material (A alloy) was developed for the problem that the wear-resistant material of the slurry pump was reduced in service life due to severe corrosion during service. The corrosion rate, corrosion characteristics, electrochemical characteristics and passivation film composition of the materials in the mixed acid solution in the simulated service environment were examined by metallographic microscope, X-ray diffractometer, total immersion corrosion, scanning electron microscopy, polarization curve, impedance spectroscopy, X-ray photoelectron spectroscopy, compared with SUS316L stainless steel and KMTBCr26 high chromium cast iron. The results showed that A alloy microstructure consists of a high chromium austenite matrix and a high hardness M23C6 carbide. This type of carbide gives the material excellent corrosion resistance. Corrosion at room temperature for 192 h, the corrosion rates of A alloy, SUS316L and KMTBCr26 were 0.019 7 mm/y, 0.322 mm/y and 26.039 6 mm/y, respectively. A small amount of pitting pits appeared on the surface of A alloy, while local corrosion or even overall corrosion occurred on the surface of SUS316L and KMTBCr26. There is no depletion of Cr content in the A alloy matrix after precipitation of carbides, which reduces the corrosion potential difference between the phase and the matrix. The Cu element rich in the material improve the stability of the surface passivation film. In the electrochemical corrosion process, A alloy has the highest self-corrosion potential, the lowest corrosion current density, the largest impedance radius and the lowest corrosion tendency, and the strongest surface passivation film. The composition is Fe2O3, Cr2O3 and some Cu oxide.
谭騛, 宁兆祥, 许晓嫦, 任鹏禾, 陈广兴. 新型渣浆泵用材料的腐蚀性能研究[J]. 材料导报, 2019, 33(24): 4157-4163.
TAN Fei, NING Zhaoxiang, XU Xiaochang, REN Penghe, CHEN Guangxing. Study on Corrosion Properties of New Material for Slurry Pump. Materials Reports, 2019, 33(24): 4157-4163.
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2019, Vol. 33 
