Faculty of Foundry Engineering, AGH University of Science and Technology, Reymonta 23 Street, 30-059 Krakow, Poland.
Int J Mol Sci. 2021 Aug 2;22(15):8301. doi: 10.3390/ijms22158301.
Chitosan coatings are deposited on the surface of Mg20Zn magnesium alloy by means of the spin coating technique. Their structure was investigated using Fourier Transform Infrared Spectroscopy (FTIR) an X-ray photoelectron spectroscopy (XPS). The surface morphology of the magnesium alloy substrate and chitosan coatings was determined using Scanning Electron Microscope (FE-SEM) analysis. Corrosion tests (linear sweep voltamperometry and chronoamperometry) were performed on uncoated and coated magnesium alloy in the Hank's solution. In both cases, the hydrogen evolution method was used to calculate the corrosion rate after 7-days immersion in the Hank's solution at 37 °C. It was found that the corrosion rate is 3.2 mm/year and 1.2 mm/year for uncoated and coated substrates, respectively. High corrosion resistance of Mg20Zn alloy covered by multilayer coating (CaP coating + chitosan water glass) is caused by formation of CaSiO and Ca(PO) compounds on its surface.
壳聚糖涂层通过旋涂技术沉积在 Mg20Zn 镁合金表面。使用傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）研究了它们的结构。使用扫描电子显微镜（FE-SEM）分析确定了镁合金基底和壳聚糖涂层的表面形态。在汉克溶液中对未涂层和涂层的镁合金进行了腐蚀测试（线性扫描伏安法和计时安培法）。在这两种情况下，均使用氢析出法计算了在 37°C 的汉克溶液中浸泡 7 天后的腐蚀速率。结果发现，未涂层和涂层基底的腐蚀速率分别为 3.2mm/年和 1.2mm/年。多层涂层（CaP 涂层+水玻璃壳聚糖）覆盖的 Mg20Zn 合金具有高耐腐蚀性，这是由于其表面形成了 CaSiO 和 Ca(PO)化合物。
