首页|激光熔覆功率对FeCrNiCoMoBSi高熵合金涂层电化学腐蚀性能的影响

激光熔覆功率对FeCrNiCoMoBSi高熵合金涂层电化学腐蚀性能的影响

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探讨了 FeCrNiCoMoBSi高熵合金(HEA)激光熔覆涂层的微观结构以及激光功率对涂层物相和电化学腐蚀性能的影响.研究结果显示,H E A涂层由底部的柱状晶带、顶部的等轴晶带以及中间混晶带(由柱状晶和等轴晶混合组成)构成.采用3 000W功率制备的HEA涂层表现出最低的自腐蚀电流密度(0.425 μA/cm2)、最高的自腐蚀电位(-0.16852 V)以及最大的极化阻抗(69 616 Ω),其阻抗模值|Z|为1 143Ω·cm2,分别是 1 800,2 500和4 500 W功率激光熔覆涂层的8.65倍、4.91倍和7.14倍,且其最大相位角为76.23°,均高于其它三种涂层.综合评估显示,采用3 000 W功率制备的HEA涂层具有出色的电化学腐蚀性能.这是由于其单一的FCC晶体结构、抗腐蚀的铁镍合金相和单质铬相、良好的晶体结晶度、细化的晶粒尺寸以及卓越的钝化效应,使其电化学腐蚀性能显著优于其他功率制备的涂层.
Effect of laser cladding power on the electrochemical corrosion performance of FeCrNiCoMoBSi high-entropy alloy coatings
The microstructure of FeCrNiCoMoBSi high entropy alloy(HEA)laser cladding coating and the effects of la-ser power on the phase and electrochemical corrosion properties of the coating were investigated.The results show that the HEA coating is composed of columnar crystal band at the bottom,equiaxed crystal band at the top and mixed crystal band in the middle(composed of columnar crystal and equiaxed crystal).The HEA coating prepared at 3000 W exhibits the lowest self-corrosion current density(0.425 μA/cm2),the highest self-corrosion potential(-0.16852 V)and the largest polarization impedance(69 616 Ω).Its impedance modulus is 1 143 Ω·cm2,which is 8.65 times,4.91 times and 7.14 times of the laser cladding coatings prepared at 1 800 W,2 500 W and 4 500 W,respectively,as well as its maxi-mum phase angle is 76.23°,which is higher than the other three coatings.The comprehensive evaluation shows that the HEA coating prepared at 3000 W exhibits excellent electrochemical corrosion performance.This is due to its single FCC crystal structure,corrosion-resistant Fe-Ni alloy phase and elemental chromium phase,good crystal crystallinit,fine grain size and excellent passivation effect,making its electrochemical corrosion performance significantly superior to oth-er power prepared coatings.

high-entropy alloy coatingadditive manufacturinglaser claddingmicrostructureelectrochemical corrosion

解芳、翟长生、荣海松、郑红星、周宏胭、武冰冰、张欣、张拯恺

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南阳理工学院河南省增材制造航空材料工程研究中心,河南南阳 473004

南阳理工学院南阳市增材制造技术与装备重点实验室,河南南阳 473004

岩柏增材智造(徐州)科技有限公司,江苏徐州 221116

高熵合金涂层 增材制造 激光熔覆 微观组织 电化学腐蚀

国家自然科学基金国家自然科学基金国家自然科学基金河南省重点研发与推广专项(科技攻关)河南省高等学校重点科研项目河南省自然科学基金南阳市基础与前沿技术研究专项南阳市基础与前沿技术研究专项

51605230523710331227424523210222102221A46002123230042032823JCQY100123JCQY2013

2024

10.3969/j.issn.1001-9731.2024.04.005

功能材料
重庆材料研究院 中国仪器仪表学会仪表材料学会

功能材料

CSTPCD北大核心
影响因子：0.918
ISSN：1001-9731
年,卷(期)：2024.55(4)
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