High-velocity oxygen fuel coatings were produced using gas-atomized Al 62.5 Cu 25 Fe 12.5 and Al 67 Cu 20 Fe 5 Cr 8 powders onto a ferritic stainless-steel substrate, resulting in two similar microstructures, consisting mainly of quasicrystalline phases. The goal of this work was to evaluate the performance of the quasicrystalline coatings under standard wear and corrosion tests. The samples were characterized by x-ray diffraction and scanning and transmission electron microscopy. Wear and friction behavior of the coatings and substrate were assessed by pin-on-disk tests. Vickers microhardness was also measured. The corrosion resistance was assessed through electrochemical measurements performed in alkaline and acidic medium in the absence and in the presence of chlorides. The coefficient of friction of the quasicrystalline coatings were inferior to the substrate, particularly the Al-Cu-Fe coating, with values close to 0.1. The Al 62.5 Cu 25 Fe 12.5 alloy also showed the lowest specific wear rate, 1.7 × 10 −4 mm 3 /N m, among the materials tested. In the presence of chlorides, the chromium containing coating presented better corrosion resistance with less surface damage after testing. However, the corrosion rate of the coating samples was low in both chloride-free alkaline and acidic conditions. Both Al 62.5 Cu 25 Fe 12.5 and Al 67 Cu 20 Fe 5 Cr 8 coatings presented corrosion potential considerably lower than the substrate for all tested media, which may be interesting for cathodic protection.

中文翻译：

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超音速火焰法制备Al-Cu-Fe-(Cr)准晶涂层的磨损和腐蚀性能

使用气体雾化的 Al 62.5 Cu 25 Fe 12.5 和 Al 67 Cu 20 Fe 5 Cr 8 粉末在铁素体不锈钢基材上生产高速氧燃料涂层，产生两种类似的微观结构，主要由准晶相组成。这项工作的目的是评估准晶涂层在标准磨损和腐蚀测试下的性能。样品通过 X 射线衍射和扫描和透射电子显微镜进行表征。涂层和基材的磨损和摩擦行为通过销盘试验进行评估。还测量了维氏显微硬度。通过在碱性和酸性介质中在没有和有氯化物存在的情况下进行电化学测量来评估耐腐蚀性。准晶涂层的摩擦系数低于基体，尤其是 Al-Cu-Fe 涂层，其值接近 0.1。在所测试的材料中，Al 62.5 Cu 25 Fe 12.5 合金也表现出最低的比磨损率，1.7 × 10 -4 mm 3 /N m。在氯化物的存在下，含铬涂层在测试后表现出更好的耐腐蚀性和更少的表面损伤。然而，涂层样品在无氯碱性和酸性条件下的腐蚀速率都很低。对于所有测试介质，Al 62.5 Cu 25 Fe 12.5 和Al 67 Cu 20 Fe 5 Cr 8 涂层的腐蚀电位均远低于基材，这可能对阴极保护感兴趣。在所测试的材料中，5 号合金的比磨损率最低，为 1.7 × 10 -4 mm 3 /N m。在氯化物的存在下，含铬涂层在测试后表现出更好的耐腐蚀性和更少的表面损伤。然而，涂层样品在无氯碱性和酸性条件下的腐蚀速率都很低。对于所有测试介质，Al 62.5 Cu 25 Fe 12.5 和Al 67 Cu 20 Fe 5 Cr 8 涂层的腐蚀电位均远低于基材，这可能对阴极保护感兴趣。在所测试的材料中，5 号合金的比磨损率最低，为 1.7 × 10 -4 mm 3 /N m。在氯化物的存在下，含铬涂层在测试后表现出更好的耐腐蚀性和更少的表面损伤。然而，涂层样品在无氯碱性和酸性条件下的腐蚀速率都很低。对于所有测试介质，Al 62.5 Cu 25 Fe 12.5 和Al 67 Cu 20 Fe 5 Cr 8 涂层的腐蚀电位均远低于基材，这可能对阴极保护感兴趣。涂层样品在无氯碱性和酸性条件下的腐蚀速率都很低。对于所有测试介质，Al 62.5 Cu 25 Fe 12.5 和Al 67 Cu 20 Fe 5 Cr 8 涂层的腐蚀电位均远低于基材，这可能对阴极保护感兴趣。涂层样品在无氯碱性和酸性条件下的腐蚀速率都很低。对于所有测试介质，Al 62.5 Cu 25 Fe 12.5 和Al 67 Cu 20 Fe 5 Cr 8 涂层的腐蚀电位均远低于基材，这可能对阴极保护感兴趣。