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High temperature corrosion behaviour of microcrystalline aluminide coating on Q235 steel

机译：Q235钢上微晶铝化物涂层的高温腐蚀行为

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Vibrating electrospark deposition equipment was developed to prepare metal coatings with high deposition efficiency. A Fe-Al intermetallic compound layer with thickness of ∼100 μm was formed on Q235 steel. The experimental results for oxidation in air at 600°C for 200 h and sulphuration in flowing 99·98%SO2 at 600°C for 50 h using SEM, EDS and XRD analyses show that the high temperature oxidation and sulphuration resistance of sample with aluminide coating have been improved remarkably. The reasons are as follows: first, the Al content of Fe-Al intermetallic compound coating is high enough to form protective oxide scales so that catastrophic oxidation and sulphuration were avoided; second, the microcrystalline structure of coating promotes selective oxidation and the spallation resistance of scales; third, thick aluminide coating can act as the Al reservoir to support the formation of Al2O3 oxide scales and the coatings are metallurgically bonded with the substrate. Voltage of 22·5-30 V will be favourable for vibrating electropulse deposition on Q235 steel.
机译：开发了振动电火花沉积设备以制备具有高沉积效率的金属涂层。在Q235钢上形成厚度约为100μm的Fe-Al金属间化合物层。 SEM，EDS和XRD分析表明，在600℃的空气中氧化200h，在99°98％SO 2 在600℃的空气中硫化50h的硫化实验表明，高温铝化物涂层样品的抗氧化和抗硫化性能得到了显着改善。原因如下：首先，Fe-Al金属间化合物涂层的Al含量高到足以形成保护性氧化皮，从而避免了灾难性的氧化和硫化。其次，涂层的微晶结构促进了氧化的选择性和氧化皮的抗剥落性。第三，厚的铝化物涂层可以作为Al的储层，以支持Al 2 O 3 氧化皮的形成，并且该涂层与基体冶金结合。 22·5-30 V的电压将有利于振动Q235钢上的电脉冲沉积。

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