低能量密度激光重熔对冷喷涂FeCoCrMoBCY非晶合金涂层性能的影响

Chaoyu Han, Li Ma, Xudong Sui, Bojiang Ma, Guosheng Huang
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引用次数: 4

摘要

铁基非晶合金(FAA)具有优异的抗腐蚀和抗磨蚀综合性能。然而,高孔隙率的喷涂薄FAA涂层不能提供有效的保护,甚至由于电偶腐蚀而加速基体的腐蚀速度。激光重熔致密化通常用于提高喷涂涂层的防腐性能。常见的激光重熔方法存在结晶和残余应力两个缺点。本文采用低密度能量激光重熔的方法,提高了40Cr基板上冷喷涂FeCoCrMoBCY FAA涂层的性能。结果表明,CS - FAA涂层在熔融过程中发生了部分结晶。激光重熔后,涂层在熔区硬度得到提高,抗磨蚀性能得到改善。动电位试验结果表明,激光重熔可以降低腐蚀速率,但盐雾试验表明,低能量密度重熔不能消除渗透扩散通道。该方法的防腐性能有待进一步优化。
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Influence of Low Energy Density Laser Re-Melting on the Properties of Cold Sprayed FeCoCrMoBCY Amorphous Alloy Coatings
Fe-based amorphous alloys (FAA) have excellent anti-corrosion and anti-abrasive comprehensive performances. However, sprayed thin FAA coatings with high porosity cannot provide efficient protection, or even accelerate the corrosion rate of the substrate due to galvanic corrosion. Laser re-melting densifying is usually used to improve the anti-corrosion performance of sprayed coatings. There are two disadvantages of the common laser re-melting method, including crystallization and residual stress. In the present paper, a low density energy laser re-melting method was used to improve the performance of cold spraying (CS) FeCoCrMoBCY FAA coating on 40Cr substrate. The results show that the CS FAA coatings were crystallized partially during the melting process. The hardness of the coating is improved at the melting zone after laser re-melting, which improves the anti-abrasive performance. Potentiodynamic test results show that laser re-melting can decrease the corrosion rate, but the salt spray test indicates that low energy density re-melting cannot eliminate penetrated diffusion passage. Further optimization should be conducted to improve the anticorrosion performance for this method.
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