Rodríguez-Alabanda Óscar, Romero Pablo E, Guerrero-Vaca Guillermo
Department of Mechanical Engineering, University of Cordoba, Medina Azahara Avenue 5, 14071 Cordoba, Spain.
Materials (Basel). 2018 Nov 17;11(11):2309. doi: 10.3390/ma11112309.
Many trays and pieces of Al-Mg and aluminized steel are used in the food industry. Sometimes these elements have non-stick coatings to solve problems related to the adhesion of masses and food products. With use, the coatings deteriorate and lose efficiency and must be removed to apply a new coating. The thermal cycles suffered by these alloys during the removal process of the deteriorated coating (500 °C) and the polymerization of a new coating (400 °C) can affect the durability and efficiency of the metallic substrates. The evolution of the mechanical and microstructural properties of the Al-Mg and aluminized steel substrates after two thermal cycles was studied in this work. The following parameters were analyzed: tensile strength, elongation (%), hardness, ASTM grain size, and the nature and distribution of the constituent particles. The report concluded that the removal of the coating, after each cycle, produced a decrease in the mechanical properties of the substrates. The hardness and tensile strength in Al-Mg decreases between 20⁻27% and in aluminized steel between 10⁻11%. In both cases, the process does not compromise the reuse of the substrate for the application of a new coating layer. The final blasting stage does not affect the Al-Mg alloys but may affect the aluminized steel Al-Si protective layer if special precautions are not taken.
食品工业中使用了许多铝镁合金托盘和渗铝钢部件。有时这些部件会有不粘涂层，以解决物料和食品粘连的问题。随着使用，涂层会恶化并失去效能，必须去除以便涂覆新的涂层。这些合金在去除劣化涂层（500℃）和新涂层聚合（400℃）过程中所经历的热循环会影响金属基材的耐久性和效能。本研究工作考察了铝镁合金和渗铝钢基材在经历两个热循环后其力学性能和微观结构性能的演变。分析了以下参数：抗拉强度、伸长率（%）、硬度、ASTM晶粒度以及组成颗粒的性质和分布。报告得出结论，每次循环后涂层的去除都会导致基材力学性能下降。铝镁合金的硬度和抗拉强度下降20⁻27%，渗铝钢下降10⁻11%。在这两种情况下，该过程都不会影响基材再次用于涂覆新涂层。最后的喷砂阶段不会影响铝镁合金，但如果不采取特殊预防措施，可能会影响渗铝钢的铝硅保护层。
