本研究以A36-IN82-316L異質銲接件，經熔射鋁處理後，將試片靜置於750 ℃ 分別進行高溫氧化及熱腐蝕試驗，藉此探討高溫氧化及熱腐蝕對熔射鋁層之破壞行為。另外以異質銲接件裸材、熔射鋁異質銲接件及經600 ℃ 熱處理之熔射鋁異質銲接件，於750 ℃ 熱腐蝕環境進行高溫潛變試驗。比較不同條件之異質銲接件，於熱腐蝕環境之斷裂模式。
　　實驗結果顯示，試片於高溫氧化環境中，A36因鋁塗層缺陷，無法形成具保護性鋁化層。試片於熱腐蝕環境中，亦因鋁塗層缺陷，無法形成緻密氧化皮膜。而不同條件之異質銲接件，進行高溫潛變試驗結果顯示，裸材、經熱處理之裸材及熔射鋁試片皆斷裂於強度最弱之A36母材。經熱處理之熔射鋁試片，因熱影響區硬度下降，造成A36與IN82界面強度差異變大，最後斷裂於A36與IN82界面。
　　異質銲接件經熔射鋁處理後，能延緩腐蝕鹽侵蝕底材速度，使試片潛變壽命增加。熔射鋁試片經熱處理後，雖能改善鋁塗層孔隙率，但另一方面，熱處理造成A36熱影響區硬度下降，使A36與IN82界面強度差異變大而從界面迅速斷裂，導致潛變壽命減少。

　　The aim of this research study was to investigate high temperature oxidation and hot corrosion behavior of thermal sprayed aluminum coating on A36-IN82-316L dissimilar weldments at 750 ℃. In addition, comparison on hot corrosion creep rupture for heat-treated and untreated bare and thermal sprayed dissimilar weldment at 750 ℃ also conducted.
　　Upon the completion of the study, it was found that aluminum coating on the specimen was unable to form a protective aluminized and oxide layer both at high temperature oxidation and during hot corrosion. Failure of the aluminum coating to form a protective layer was attributed to defect mainly formation of voids on the aluminum coating.
　　For creep test, rupture of the bare dissimilar weldment for heat-treated and untreated samples occurred at the A36 base metal. Such phenomenon also observed in thermal sprayed dissimilar weldment could be ascribed to the fact that the weakest point on the weldment is the base metal A36. However, rupture for thermal sprayed weldment occurred at the interface of A36 and IN82 with heat-treatment due to decrease of hardness on HAZ for A36 after heat-treatment.
　　We can therefore conclude that aluminum coating can highly improve both corrosion resistance of the dissimilar weldment with increased creep life. Conversely, heat-treatment of the thermal sprayed dissimilar weldment largely amplifies the difference in strength at the interface of A36 and IN82 with decreased creep life due to reduction of hardness at such interface point.

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