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激光掃描速度對鎳基合金熔覆層顯微結(jié)構(gòu)和耐腐蝕性能的影響
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華北電力大學 電站能量傳遞轉(zhuǎn)化與系統(tǒng)教育部重點實驗室，北京 102206

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Effect of Laser Scanning Speed on Microstructure and Corrosion Resistance of Ni-based Alloy Coatings
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Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, North China Electric Power University, Beijing 102206, China

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    摘要:

    采用激光熔覆技術在Q235鋼表面制備了鎳基合金（含質(zhì)量分數(shù)24%Cr、13%Mo）熔覆層，研究了激光掃描速度（100、200和300 mm/s）對熔覆層顯微結(jié)構(gòu)和耐腐蝕性能的影響，分析了熔覆層的顯微組織、相組成、元素稀釋率、顯微硬度和耐腐蝕性能。結(jié)果表明，熔覆層由γ-Ni(C, Mo, Fe)和Cr0.19Fe0.7Ni0.11固溶體組成。隨著激光掃描速度的提高，熔覆層晶粒細化，元素稀釋率降低，顯微硬度提高。由于元素稀釋率較高，在掃描速度100 mm/s制備的熔覆層在3.5%（質(zhì)量分數(shù)）NaCl溶液中浸泡2 h后的腐蝕電位最低。但由于熔覆層質(zhì)量好，表面鈍化膜穩(wěn)定，在3.5% NaCl溶液中浸泡7 d后，其耐腐蝕性能仍優(yōu)于其他2種涂層。

    Abstract:

    Ni-based alloy (24wt% Cr, 13wt% Mo, and balanced Ni) coatings were prepared by laser cladding technique on Q235 steel. The effects of laser scanning speed (100, 200, and 300 mm/s) on microstructure and corrosion resistance of coatings were investigated. The microstructures, phase composition, element dilution rate, microhardness, and corrosion resistance of the coatings were analyzed. Results show that coatings consist of γ-Ni(Cr, Mo, Fe) and Cr0.19Fe0.7Ni0.11 solid solution. The grain size is refined, the element dilution rate is decreased, and the microhardness is enhanced with increasing the laser scanning speed. The coating prepared at scanning speed of 100 mm/s exhibits the lowest corrosion potential after immersion in 3.5wt% NaCl solution for 2 h due to its high element dilution rate. Whereas this coating shows better corrosion resistance than the other two coatings do after immersion in 3.5wt% NaCl solution for 7 d due to the good coating quality and stable passive film.

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孔耀,劉宗德,劉泉兵.激光掃描速度對鎳基合金熔覆層顯微結(jié)構(gòu)和耐腐蝕性能的影響[J].稀有金屬材料與工程,2023,52(5):1624~1632.[Kong Yao, Liu Zongde, Liu Quanbing. Effect of Laser Scanning Speed on Microstructure and Corrosion Resistance of Ni-based Alloy Coatings[J]. Rare Metal Materials and Engineering,2023,52(5):1624~1632.]
DOI：10.12442/j. issn.1002-185X.20220549

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  • 收稿日期:2022-06-27
  • 最后修改日期:2022-07-30
  • 錄用日期:2022-08-12
  • 在線發(fā)布日期: 2023-05-31
  • 出版日期: 2023-05-29