海上風電為應對嚴苛的工作環境，主要利用不同材料塗層構成有效抗環境腐蝕的防蝕系統，而在進一步發展中，為了使防蝕機制更加完善，使用粉末噴塗製程疊加高熵合金塗層在金屬塗層與316 基材間，作為中間塗層改善風力發電機塔柱的防蝕性能，可能是持續突破風機壽命的方案之一。故本實驗使用得以產出高品質粉末之氣體霧化法製備AlCrFeNi 粉末，進行熱處理試驗，對照其微觀形貌、晶體結構與成分組成的改變，比較其機械性質並透過鹽霧與酸液浸泡實驗研究其腐蝕行為，期望此合金之抗腐蝕性能得以作為海上風力發電機之中間塗層材料。合金粉末分別於500 至12001200℃固定持溫1 小時，並進行10001000℃下16 至36 小時長時間之熱處理後，皆與未經熱處理之粉末由A lNi 所組成的BCC/B2 相與F eCr 所組成的BCC/A2 結構相同，且於10001000℃ 36 小時之熱處理後，其內部有晶粒尺寸成長與相分離現象，而於粉末外圍出現之氧化鋁層，說明此合金具有耐高溫氧化之特性。利用熱力學演算後，因Al 與Ni 元素間具有最低之混合焓，加上A l 較大之原子半徑使合金發生晶格扭曲，阻礙元素的擴散並抑制生成析出相，形成有序之AlNi及無序之FeCr 組成的BCC 結構。在機械性質方面，熱處理前後之平均硬度分別為7.15 GPa與7.06 GPaGPa，說明熱處理所致的晶粒尺寸成長及相分離，與硬度數值間在此合金中沒有對應關係。5% NaCl 鹽霧腐蝕試驗中，於1095 小時內，AlCrFeNi 粉末皆無出現腐蝕痕跡，而316 不鏽鋼在73 小時後，發現些微孔蝕跡象，並隨著時間而增加；說明AlCrFeNi 擁有比316 不鏽鋼更佳之應對海岸環境侵蝕能力。在酸液浸泡試驗中，pH 4.5 之H2SO4 水溶液僅對316 不鏽鋼造成影響；而在pH 2.5 的酸液侵蝕後，316 不鏽鋼與腐蝕前之表面粗糙度差距為+ 62%；AlCrFeNi 初始及熱處理後之合金粉末，分別為+ 及+ 42%，說明AlCrFeNi 粉末在熱處理前後的耐酸蝕性皆高於316 不鏽鋼。綜觀上述研究後，可證明AlCrFeNi 合金粉末具有良好的機械性能與抗腐蝕特性，其中熱處理後之粉末，因晶粒尺寸之變化及相分離情形，降低其耐蝕性，使初始粉末擁有最佳之特性，而這些性質皆對海上風力發電機的應用至關重要，可以期待此合金在領域內的發展。

In further development, in order to improve the anti corrosion mechanism, the use of powder coating process to superimpose high entropy alloy coating between metal coating and Stainless Steel 316 base material as an intermediate coating to improve the anti corrosion performance of wind turbine towers may be one of the solutions for sustainable breakthrough in wind turbine life. Therefore, in this experiment, AlCrFeNi powder was prepared by gas atomization method, which can produce high quality powder, and heat treatment test was conducted to compare its microscopic morphology, crystalline structure and composition changes, and to compare its mechanical properties and study its corrosion behavior by salt spray and acid immersion test. The alloy powders were subjected to a fixed temperature of 500 to 1200°C for 1 hour and heat treatment at 1000°C for 16 to 36 hours, and the structure of BCC/B2 phase composed of AlNi and BCC/A2 composed of FeCr was the same as that of the untreated powder. The appearance of the alumina layer around the powder ind icates that this alloy has the characteristics of high temperature oxidation resistance. After thermodynamic calculations, the alloy has the lowest mixing enthalpy between Al and Ni elements, and the larger atomic radius of Al distorts the lattice, which h inders the diffusion of elements and inhibits the generation of precipitation phases,
forming a BCC structure composed of ordered AlNi and disordered FeCr. In terms of mechanical properties, the average hardness before and after heat treatment was 7.15 GPa and 7.06 GPa respectively, indicating that there was no correspondence between the grain size growth and phase separation caused by heat treatment and the hardness value in this alloy. It shows that
AlCrFeNi has a better ability to cope with coastal corro sion than Stainless Steel 316 . In the acid immersion test, the aqueous solution of H2SO4 at pH=4.5 only affected the stainless steel 316; after the acid corrosion at pH=2.5, the difference in surface roughness between the stainless steel
316 and before cor rosion was +62%; the alloy powder of AlCrFeNi was +21% and +42% after the initial and heat treatment, respectively. The acid and corrosion resistance of AlCrFeNi powder the initial and heat treatment, respectively. The acid and corrosion resistance of AlCrFeNi powder before and after heat treatment are higher than that of before and after heat treatment are higher than that of stainless steel stainless steel 316. After the above study, 316. After the above study, it can be proved that the AlCrFeNi alloy powder has good mechanical properties and antiit can be proved that the AlCrFeNi alloy powder has good mechanical properties and anti--corrosion properties. The change of grain size and phase separation of the powder after heat corrosion properties. The change of grain size and phase separation of the powder after heat treatment reduces its corrosion resistance, so treatment reduces its corrosion resistance, so that the initial powder has the best properties, and that the initial powder has the best properties, and these properties are important fthese properties are important for offshore wind turbine applications, and we can expect the or offshore wind turbine applications, and we can expect the development of this alloy in the field.development of this alloy in the field.

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