摘要
目的 探究粉末回收再利用对等离子喷焊Ni-WC涂层微观组织结构及静态腐蚀、冲刷腐蚀行为的影响规律,揭示涂层腐蚀及冲刷腐蚀机理。方法 通过等离子喷焊技术在AISI 4145H钢表面制备了以新粉(C-p_(1))和回收粉(C-p_(2))为原料的Ni-WC涂层,并通过冲刷腐蚀装置和电化学工作站等开展涂层的冲刷腐蚀行为研究。采用扫描电子显微镜对冲刷腐蚀前后涂层的微观组织结构和元素分布等进行表征分析。结果 在静态条件下,C-p_(1)的容抗弧半径大于C-p_(2),且C-p_(1)的自腐蚀电流(J_(corr))为2.09×10~(-6)A/cm^(2),而C-p_(2)的J_(corr)为1.03×10^(-5)A/cm^(2),表明C-p_(1)的耐蚀性高于C-p_(2)。在冲刷腐蚀条件下,随冲刷角的增加,两涂层耐蚀性均先增大后减小,且在0°时最差,表明涂层受切削作用明显,涂层表面氧化物膜被破坏,使腐蚀加速。随流速增加,两涂层耐蚀性均减小,且在冲刷速度为6 m/s、冲刷角为0°时腐蚀最严重,此时C-p_(1)的J_(corr)为1.98×10^(-4) A/cm^(2)而C-p_(2)的J_(corr)为1.04×10^(-4) A/cm^(2),表明两涂层的耐冲刷腐蚀性相似。结论 在静态腐蚀条件下,C-p_(2)的耐蚀性比C-p_(1)差,但在冲刷腐蚀条件下,二者的抗冲刷腐蚀性相仿,说明面向冲刷腐蚀工况的Ni-WC涂层,使用回收粉进行制备具有可行性。
The effects of powder recycling on the microstructure,static corrosion and erosion-corrosion behavior of plasma spray-welded Ni-WC coatings was investigated, and the corrosion and erosion-corrosion mechanisms of the coatings were revealed. Ni-WC coatings were prepared on the surface of AISI 4145H steel by plasma spray-welded technology with received powder (C-p_(1)) and recovered powder (C-p_(2)) as raw materials. The erosion-corrosion behavior of the coatings was studied by erosion-corrosion device and electrochemical workstation. The microstructure and element distribution of the coatings before and after erosion-corrosion were characterized by scanning electron microscopy. Under static conditions, the capacitive arc radius of C-p_(1) was larger than that of C-p_(2), and the self-corrosion current (Jcorr) of C-p_(1) was 2.09×10−6 A/cm^(2), while the Jcorr of C-p_(2) was 1.03×10^(−5) A/cm^(2), indicating that the corrosion resistance of C-p_(1) was higher than that of C-p_(2). Under the condition of erosion-corrosion, with the increase of the erosion angle, the corrosion resistance of the two coatings first increased and then decreased. When the erosion angle was 0°, the surface of the coating was most affected by the shear stress, and the oxide film on the surface of the coating was destroyed, which accelerated the corrosion. With the increase of scouring velocity, the corrosion resistance of the C-p_(1) and C-p_(2) decreased. The corrosion was the most serious when the scouring velocity was 6 m/s and the erosion angle was 0°, the Jcorr of C-p_(1) was 1.98×10^(−4) A/cm^(2) and the Jcorr of C-p_(2) was 1.04×10^(−4) A/cm^(2), respectively, indicating that the erosion-corrosion resistance of the two coatings was similar. Under static corrosion conditions, the corrosion resistance of C-p_(2) is worse than that of C-p_(1), but under erosion-corrosion conditions, the erosion-corrosion resistance of C-p_(1) and C-p_(2) is similar, indicating that it is feasible to prepare Ni-WC coatings for erosion-corrosion conditions using recovered powder.
作者
柴慧
王勤英
西宇辰
马文祺
张兴寿
肖檬
董立谨
白树林
CHAI Hui;WANG Qinying;XI Yuchen;MA Wenqi;ZHANG Xinshou;XIAO Meng;DONG Lijin;BAI Shulin(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;School of Materials Science and Engineering,Peking University,Beijing 100871,China)
出处
《表面技术》
北大核心
2025年第6期74-86,共13页
Surface Technology
基金
国家自然科学基金(52174007)
中央引导地方科技发展专项资金项目(2023ZYD0043)
四川省省院省校科技合作项目(2025YFHZ0050)。
