Composite coatings are coatings that have been considered in terms of properties, such as corrosion resistance, oxidation resistance and excellent hardness. In this study, $$\hbox {Ni}$$–$$\hbox {P}$$–$$\hbox {Al}_{2}\hbox {O}_{3}$$–$$\hbox {TiO}_{2}$$ composite coating was made on AISI 316 steel using direct current deposition technique. The microstructure of the coating and its corrosion resistance were studied by changing the amount of titanium oxide (1, 2, 3 and $$4~\hbox {g l}^{-1})$$ in the bath. To investigate the morphology of the coating and the analysis of the coated material, a scanning electron microscope (SEM) and EDS microscopy were conducted, respectively. The results showed that in the bath containing $$4~\hbox {g l}^{-1}$$ titanium oxide, the coating is perfectly uniform and continuous, while by reducing the amount of titanium oxide, it is not possible to form a suitable coating on the entire surface of the substrate. To investigate the corrosion resistance, the potentiodynamic polarization and electrochemical impedance spectroscopy tests in aqueous solution of 3.5% NaCl were carried out on coated and uncoated samples. The results of these tests were also correlated with microscopic images and showed that the coatings in a bath containing $$4~\hbox {g l}^{-1}$$ titanium oxide has the highest corrosion resistance.

中文翻译：

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氧化钛陶瓷颗粒浓度对$$\text {Ni}$$Ni–$$\text {P}$$P–$$\text {Al}_{{2}}\text 微观结构和腐蚀行为的影响{O}_{{3}}$$Al2O3–$$\text {TiO}_{{2}}$$TiO2 复合涂层

复合涂层是在性能方面考虑的涂层，例如耐腐蚀性、抗氧化性和优异的硬度。在本研究中，$$\hbox {Ni}$$–$$\hbox {P}$$–$$\hbox {Al}_{2}\hbox {O}_{3}$$–$$\ hbox {TiO}_{2}$$ 复合涂层是使用直流沉积技术在 AISI 316 钢上制成的。通过改变镀液中氧化钛(1、2、3和$$4~\hbox{gl}^{-1})$$的量来研究涂层的微观结构及其耐腐蚀性能。为了研究涂层的形态和涂层材料的分析，分别进行了扫描电子显微镜 (SEM) 和 EDS 显微镜检查。结果表明，在含有$$4~\hbox {gl}^{-1}$$二氧化钛的镀液中，镀层非常均匀连续，而通过减少氧化钛的量，不可能在基材的整个表面形成合适的涂层。为了研究耐腐蚀性，在 3.5% NaCl 水溶液中对涂层和未涂层​​样品进行动电位极化和电化学阻抗谱测试。这些测试的结果还与显微图像相关联，表明在含有 $$4~\hbox {gl}^{-1}$$ 氧化钛的镀液中的涂层具有最高的耐腐蚀性。