(1. 沈陽理工大學 裝備工程學院，沈陽 110159；
2. 沈陽工業(yè)大學 材料科學與工程學院，沈陽 110870)
摘 要: 采用電弧離子鍍技術(shù)在鎳基單晶合金表面沉積Ni28Cr11Al0.5Y涂層，研究鎳基單晶合金及其Ni28Cr11Al0.5Y涂層在900 ℃的75%Na2SO4+25% K2SO4(質(zhì)量分數(shù))熔鹽中的熱腐蝕行為。結(jié)果表明：鎳基單晶合金受到了嚴重的熱腐蝕，鎳基單晶合金內(nèi)部出現(xiàn)了嚴重的內(nèi)硫化和內(nèi)氧化現(xiàn)象，且內(nèi)硫化物區(qū)域和內(nèi)氧化物區(qū)域出現(xiàn)明顯分層結(jié)構(gòu)，與外腐蝕層相鄰的區(qū)域為內(nèi)氧化區(qū)域，遠離外腐蝕層的基體內(nèi)部形成內(nèi)硫化區(qū)域；而Ni28Cr11Al0.5Y涂層在熱腐蝕過程中，表面生成連續(xù)的Al2O3氧化膜，且隨腐蝕時間延長，Al2O3氧化膜的厚度增大，表現(xiàn)出優(yōu)良的抗熱腐蝕性能。
關(guān)鍵字: 鎳基單晶合金；電弧離子鍍；熔鹽；熱腐蝕；內(nèi)氧化；內(nèi)硫化
（1. Equipment Engineering College, Shenyang Ligong University, Shenyang 110159, China;
2. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China）
Abstract:Ni28Cr11Al0.5Y coatings were deposited on a single crystal Ni-base superalloy substrate by arc ion plating. The corrosion behaviors of the superalloy and Ni28Cr11Al0.5Y coatings in molten 75%Na2SO4+25% K2SO4 (mass fraction) at 900 ℃ were studied. The results indicate that the superalloy suffer catastrophic hot corrosion, and serious internal oxidation and internal sulfidation occur in a single crystal Ni-base superalloy. The regions near the layer of the surface are identified as the internal oxidizing zones, and the matrix region far from the layer of the surface is identified as the internal sulfidation zone. During the hot corrosion of Ni28Cr11Al0.5Y, the continuous Al2O3 oxidation film forms, and with the hot corrosion time increasing, the oxidation film becomes thick and has better hot corrosion resistance property.
Key words: single crystal Ni-base superalloy; arc ion plating; molten sulfate; hot corrosion; internal oxidation; internal sulfidation
