Anwar Shams, Zhang Yahui, Khan Faisal
Centre for Risk, Integrity and Safety Engineering (C-RISE), Faculty of Engineering & Applied Science, Memorial University St. John's NL A1B 3X5 Canada
RSC Adv. 2018 Aug 14;8(51):28861-28873. doi: 10.1039/c8ra04650f.
Anticorrosive coatings are a useful approach for protecting steel structures/machinery against corrosion. Electrodepositions of zinc and zinc-nickel alloy films on steel substrates under various conditions from baths containing potassium citrate were studied. The effects of electroplating variables such as bath composition and current density on the coating composition, morphology, corrosion and mechanical properties were systematically investigated. The electrochemical and mechanical behaviour of Zn-Ni deposits obtained at 60 mA cm from the citrate bath exhibited a lower corrosion current ( ) and a less negative corrosion potential ( ) compared to pure Zn and Zn-Ni alloy coatings from the non-citrate bath. The crystallite size of the Zn-Ni coating deposited from the citrate bath was 35.40 nm, and the Ni content of the coating was 8.3 wt%. The morphological properties and crystalline phase structure of the alloy coating were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The topographical structure of the coatings was analyzed by atomic force microscopy (AFM). The dominant γ-NiZn (815) and γ-NiZn (330) (631) plane orientations in the zinc-nickel alloy films improved the corrosion resistance. Zn-Ni films with smaller grain size and uniform coating had an increased impedance modulus and improved corrosion resistance.
防腐涂层是保护钢结构/机械免受腐蚀的一种有效方法。研究了在含有柠檬酸钾的镀液中，在各种条件下在钢基体上电沉积锌和锌镍合金膜。系统地研究了电镀变量如镀液成分和电流密度对涂层成分、形态、耐腐蚀性和机械性能的影响。与来自非柠檬酸盐镀液的纯锌和锌镍合金涂层相比，在60 mA/cm²下从柠檬酸盐镀液中获得的锌镍镀层的电化学和力学行为表现出较低的腐蚀电流（ ）和较正的腐蚀电位（ ）。从柠檬酸盐镀液中沉积的锌镍涂层的微晶尺寸为35.40 nm，涂层的镍含量为8.3 wt%。通过扫描电子显微镜（SEM）和X射线衍射（XRD）对合金涂层的形态性能和晶相结构进行了研究。通过原子力显微镜（AFM）分析了涂层的表面形貌结构。锌镍合金膜中占主导地位的γ-NiZn(815)和γ-NiZn(330)(631)平面取向提高了耐腐蚀性。晶粒尺寸较小且涂层均匀的锌镍膜具有更高的阻抗模量和更好的耐腐蚀性。
