长城1号防护涂层抗热腐蚀的性能

Investigation of Hot Corrosion of Great Wall No.1 Coating

摘要: 用等离子喷涂方法将长城1号及X-40涂层镀复在GH864高温合金试样上,然后进行热腐蚀试验,并用OM,SEM、EMPA进行性能分析。结果表明,长城1号涂层显示出比X-40涂层更优越的腐蚀抗力。提出了长城1号、X-40涂层及GH864基体合金可能的腐蚀机制。

Abstract: High temperture corrosion tests in 75%Na₂SO₄-25%NaCl molten salt have been conducted on GH864 superalloy specimens plasma sprayed with great wall No.1 and X-40 coatings. After the corrosion tests,each sample was examined by OM, SEMand EMPA.It was found that X-40 coating was severely corroded by the molten salt due to cracking and spalling, whereas the Great Wall No.1 exhibited superior corrosion resistance.