摘要
A straightforward,highly effective,and environmentally friendly technique was investigated for protecting carbon steel surfaces from corrosion,i.e.,depositing Cu-Ni alloy coatings on the workpiece’s surface to impede corrosive medium.The effects of current density and copper ion concentration(Cu^(2+))on the composition,morphology,and properties of the coating were analyzed using scanning electron microscope,X-ray energy dispersive spectrometer,Vickers hardness tester,friction and wear tester,and electrochemical testing.Results show that a cauliflower-like Ni-rich protrusion structure appears on the coating surface.The lower current density and Cu^(2+)concentration affect the Vickers hardness and wear resistance of the coating by altering the microstructure and Cu/Ni content,both leading to a decrease in hardness and wear resistance.When the current density is 10 mA·cm^(-2)and the Cu^(2+)concentration is 0.1 mol·L^(−1),the corrosion current density of the deposited sample reaches 1.389×10^(−5)A·cm^(-2),and its surface corrosion damage is reduced compared to the uncoated sample after 24 h of salt spray test.Research on the deposition mechanism indicates that Cu^(2+)undergoes instantaneous nucleation under diffusion control,tending to grow vertically and form cauliflower-like protrusions,while Ni^(2+)is discharged uniformly across the surface under electrochemical control.
研究了一种简单、高效、环保的防腐技术,通过在工件表面沉积Cu-Ni合金涂层来阻止腐蚀介质,从而保护碳钢表面免受腐蚀。使用扫描电子显微镜、X射线能量色散光谱、维氏硬度计、摩擦磨损试验机和电化学测试研究了电流密度和Cu^(2+)浓度对涂层成分、形态和组成的影响。结果表明,涂层表面出现花椰菜状富镍突起结构。较低的电流密度和Cu^(2+)浓度通过影响晶粒微观结构和Cu/Ni含量来影响涂层的维氏硬度和耐磨性,从而导致硬度和耐磨性能的降低。当电流密度为10 mA·cm^(-2),Cu^(2+)浓度为0.1 mol·L^(−1)时,沉积样品的腐蚀电流密度达到1.389×10^(−5)A·cm^(-2)。经过24 h的盐雾试验后,镀层表面腐蚀损伤明显小于未覆盖镀层样品。对沉积机理的研究表明,Cu^(2+)在扩散控制下经历瞬时形核,倾向于垂直生长并形成花椰菜状突起,而Ni^(2+)则受电化学控制,在表面均匀放电。
出处
《稀有金属材料与工程》
北大核心
2025年第9期2231-2240,共10页
Rare Metal Materials and Engineering
基金
Key R&D Program of Shandong Province,China(2023SFGC0101)
National Natural Science Foundation of China(51971071,52075112,52261135538)
Fundamental Research Projects of Science&Technology Innovation and Development Plan in Yantai City(2022JCYJ023)。
