Heat Treatment of Metals ›› 2020, Vol. 45 ›› Issue (10): 191-193.DOI: 10.13251/j.issn.0254-6051.2020.10.037

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Effect of boronizing on aluminum corrosion resistance of chromium carbide coating on H13 steel

Li Keju, Wang Huajun, Gao Ye, Wang Xueyang, Zhao Xiaoyu   

  1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan Hubei 430070, China
  • Received:2020-03-24 Online:2020-10-25 Published:2020-12-29

Abstract: Specimens of untreated H13 steel, thermo-reactive diffusion (TRD)chromizing only and TRD (chromizing+boronizing) treating were immersed in molten aluminum to carry out hot-dipping aluminizing test.The cross section of the aluminized specimens was observed by microscope and composition of the aluminized layer was analyzedat fixed points. The results show that under the same hot-dipping aluminizing conditions, the thickness of aluminized layer of the chromium carbide coating without boronizing is equivalent to that of untreated H13 steel, showing that chromizing alone cannot improve the corrosion resistance of H13 steel to liquid aluminum. While the thickness of aluminized layer of boron-chromium composite coating specimen is only 67% of that of the chromium carbide coating without boronizing, which depicts that the application of boronizing treatment can effectively improve the aluminum corrosion resistance of the TRD chromium carbide coating. After hot-dipping aluminizing, the composition of Fe-Al intermetallic compound is mainly Fe2Al5.

Key words: H13 steel, thermo-reactive diffusion (TRD) treatment, boron-chromium coating, hot-dipping aluminizing

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