新型渣浆泵用材料的腐蚀性能研究

doi:10.11896/cldb.18120154

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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.

Key words： abrasive and corrosion resistant steel carbide pitting corrosion polarization curve electrochemical impedance spectroscopy

Published: 28 October 2019

CLC number:

TG174.2

About author:: Fei Tan, graduate student of Material Science and Engineering College,Central South University. His main research fields are friction and wear, corrosion and protection of metal surface and failure analysis;Xiaochang Xu Professor and Ph.D. supervisor, School of Materials Science and Engineering, Central South University. In 2008, She graduated from the Department of Materials Science and Engineering of Central South University with a doctoral degree. She has been engaged in the research and development of new metal materials for a long time, as well as the influence of hot working and heat treatment processes on the structure and properties of metal materials. Supported or participated in more than 50 scientific research projects, including 863, 973, military supporting projects, Hunan Natural Science Foundation, Hunan Science and Technology Program, and cooperated with more than 10 enterprises. There are 10 authorized invention patents. More than 80 scientific papers have been published.

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	TAN Fei
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Cite this article:

TAN Fei,NING Zhaoxiang,XU Xiaochang, et al. Study on Corrosion Properties of New Material for Slurry Pump[J]. Materials Reports, 2019, 33(24): 4157-4163.

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http://www.mater-rep.com/EN/10.11896/cldb.18120154 OR http://www.mater-rep.com/EN/Y2019/V33/I24/4157

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