Microstructure and electrochemical properties of laser cladding C276 coating on 300M steel
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摘要: 为提升300M钢表面耐腐蚀性，采用NCLT CW-1K固体Nd：YAG激光器系统，利用激光熔覆技术在300M钢表面制备Hastelloy C276涂层，对C276涂层的宏观形貌、物相组成进行表征，利用滑动摩擦磨损机、电化学工作站进行摩擦磨损、电化学测试。结果表明：激光熔覆C276涂层质量良好，C276涂层较基体显微硬度提升1.4倍，但耐磨性低于300M钢基体；涂层腐蚀电位最大，腐蚀电流密度最小，在300M钢表面采用激光熔覆技术制备出C276涂层，显著提升300M钢表面耐蚀性能，为提升材料表面的耐蚀和防腐性能提供新的方案。
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关键词:
- 300M钢 /
- Hastelloy C276 /
- 激光熔覆 /
- 微观组织 /
- 电化学
Abstract: IIn order to improve the corrosion resistance of 300M steel surface, NCLT was used in cw-1k solid-state Nd: YAG laser system, Hastelloy C276 coating with 800W laser power and 8 mm/s scanning speed was prepared on the surface of cw-1k solid-state Nd: YAG laser system. The macro morphology, microstructure, phase composition, microhardness, friction and wear properties and electrochemical properties of C276 coating were tested. The results show that the microhardness of C276 coating is increased by 1.4 compared with the substrate. However, the wear resistance of the coating is lower than that of the 300M steel substrate, the corrosion potential of the coating is the highest, the self - corrosion current density is the smallest. The C276 coating is prepared on the surface of 300M steel by laser cladding technology, which significantly improves the corrosion resistance of 300M steel surface, and provides a new scheme for improving the corrosion resistance and corrosion resistance of the material surface.-
Key words:
- 300M steel /
- Hastelloy C276 /
- laser cladding /
- microstructure /
- microstructure electrochemistry
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图 2 功率800 W、扫描速度8 mm/s工况下熔覆层宏观形貌 （a）氩气保护条件熔覆层；（b）无氩气保护条件熔覆层
Figure 2. Macro morphologies of cladding layer under 800 W power and 8 mm / s scanning speed （a） cladding layer under argon protection；（b）cladding layer without argon protection
图 5 激光熔覆制备涂层界面微观组织 （a）熔覆层底部；（b）熔覆层中部；（c）熔覆层上部；（d）熔覆层交界下部；（e）熔覆层交界中部；（f）熔覆层交界上部
Figure 5. Microstructures of coating interface prepared by laser cladding （a）bottom of fusion layer；（b）middle part of fusion layer；（c）upper part of fusion layer；（d）lower part of fusion layer；（e）middle part of fusion layer；（f）upper part of fusion layer
图 7 不同熔覆区域熔覆层的显微硬度
Figure 7. Microhardness of cladding layer in different cladding areas
图 8 300M钢基体与涂层摩擦系数曲线图
Figure 8. Friction coefficient curve of 300M steel substrate and coating
图 9 300M钢与涂层试件前后摩损量与磨损率
Figure 9. Weight loss of 300M steel and coated specimens before and after coating
图 10 C276涂层与300M钢基体的极化曲线
Figure 10. Polarization curve of C276 coating and 300M steel substrate
表 1 300M钢的化学成分（质量分数/%）
Table 1. Chemical composition of 300M steel（mass fraction/%）
C Si Mn Cr Mo Ni P S V Fe 0.41 1.66 0.64 0.71 0.37 1.90 0.009 0.0013 0.008 Bal 
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表 2 Hastelloy C276的化学成分（质量分数/%）
Table 2. Chemical composition of Hastelloy C276（mass fraction/%）
C Si Mn Cr Mo W Co Ni 0.0012 0.85 0.53 15.58 16.22 4.15 1.87 Bal
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表 3 送粉器转速与送粉量之间关系
Table 3. Relationship between the rotate speed and powder delivery amount of powder feeder
Rotate speed/（r/min） Powder delivery amount/mg 10 350 20 800 30 1400 40 2200
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表 4 极化曲线拟合结果
Table 4. Fitting results of polarization curve
Material Corrosion current
density Icorr/（A·cm2）Corrosion potential Ecorr/V C276 coating 9.25 × 10−6 −0.234 300M steel substrate 5.304 × 10−5 −0.351
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