Xu Qi, Zhou Peng, Zhang Tao, Wang Fuhui
Shenyang National Laboratory for Materials Science, Northeastern University, 3-11 Wenhua Road, Shenyang 110819, China.
Materials (Basel). 2023 Sep 13;16(18):6185. doi: 10.3390/ma16186185.
The purpose of this study is to improve the number and distribution of active particles on the MAO layer by changing the activation method, thus improving the corrosion resistance of the coating. The structure of the coatings was characterized by SEM, XRD, XPS, and AFM, as well as the corrosion resistance of the coatings by polarization curves, EIS tests, immersion tests, and salt spray tests. The conductive resistance and adhesion of different composite coatings were compared. The results demonstrate that the properties of the composite coating are significantly affected by different activation methods, and the Ni-P coating prepared with more active particles offers superior corrosion protection to the inner layer. The quantity and distribution of active particles affect the compactness of the coating by influencing the initial deposition process. The size of nickel particles is larger and the inter-grain porosity increases in the case of fewer active sites, and as the number of active sites increases, the size of nickel particles decreases, and the coating compactness increases. The mechanism of the effect of the number of active particles on the deposition process of electroless Ni-P coating was proposed.
本研究的目的是通过改变活化方法来提高MAO层上活性粒子的数量和分布，从而提高涂层的耐腐蚀性。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和原子力显微镜（AFM）对涂层结构进行表征，并通过极化曲线、电化学阻抗谱（EIS）测试、浸泡试验和盐雾试验对涂层的耐腐蚀性进行表征。比较了不同复合涂层的导电电阻和附着力。结果表明，不同的活化方法对复合涂层的性能有显著影响，制备的具有更多活性粒子的Ni-P涂层对内层具有更好的腐蚀防护作用。活性粒子的数量和分布通过影响初始沉积过程来影响涂层的致密性。在活性位点较少的情况下，镍颗粒尺寸较大且晶粒间孔隙率增加，随着活性位点数量的增加，镍颗粒尺寸减小，涂层致密性增加。提出了活性粒子数量对化学镀Ni-P涂层沉积过程影响的机理。
