Hot corrosion of the ceramic composite coating Ni3Al–Al2O3–Al2O3/MgO plasma sprayed on 316L stainless steel
Hot corrosion of the ceramic composite coating Ni3Al–Al2O3–Al2O3/MgO plasma sprayed on 316L stainless steel
复制标题
316L不锈钢上等离子喷涂陶瓷复合涂层Ni3Al-Al2O3-Al2O3/MgO的热腐蚀
DOI：
10.3139/146.111523
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Seyed Rahim Kiahosseini
中科院分区：
文献类型：
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作者：
Amir Khodaparast Shirazi;Seyed Rahim Kiahosseini
采用等离子喷涂技术在316L不锈钢表面制备了Ni 3Al-Al 2 O3-Al 2 O3/MgO三层涂层，其中Al 2 O3/MgO涂层厚度分别为50、100和150 μ m，其余涂层厚度均为100 μm。采用X射线衍射、原子力显微镜、在Na 2SO 4和V2 O 5混合腐蚀盐中的热腐蚀试验和扫描电子显微镜对样品的结构、形貌和抗热腐蚀性能进行了研究。结果表明，MgO和Al 2 O3涂层的晶粒细小。由于热腐蚀导致的重量损失从无涂层的316L不锈钢的约4.267 g降低至2.058 g。具有150 μm外涂层的样品显示出随着外层厚度的增加而提高的电阻。涂层表面的扫描电子显微镜显示，涂层的抗热腐蚀性与Al 2 O3/MgO涂层的厚度和晶粒尺寸有关。
Abstract Ni3Al–Al2O3–Al2O3/MgO three-layered coatings with thicknesses of 50, 100, and 150 μm for Al2O3/MgO and 100 μm for the other layers were deposited on 316L stainless steel using plasma spraying. X-ray diffraction, atomic force microscopy, furnace hot corrosion testing in the presence of a mixture of Na2SO4 and V2O5 corrosive salts and scanning electron microscopy were used to determine the structural, morphological and hot corrosion resistance of samples. Results revealed that the crystalline grains of MgO and Al2O3 coating were very small. Weight loss due to hot corrosion decreased from approximately 4.267 g for 316L stainless steel without coating to 2.058 g. The samples with 150 μm outer coating showed improved resistance with the increase in outer layer thickness. Scanning electron microscopy of the coated surface revealed that the coating's resistance to hot corrosion is related to the thickness and the grain size of Al2O3/MgO coatings.