高熵合金（Al（下標 5）Cr（下標 12）Fe（下標 35）Mn（下標 28）Ni（下標 20））在不同加工量下之電化學腐蝕性質研究

本研究探討高熵合金的腐蝕行為及其電化學特性之研究，加工量的增加是否有助於抗腐蝕性質，因此改變加工量比率進行探討（X=0%、30%、60%），並期以升溫的方式找尋到臨界孔蝕溫度。實驗分別於氯化鈉、硫酸、氯化銨及氟化鈉溶液中進行，結果顯示：在室溫環境之下，304不銹鋼的抗孔蝕能力高於高熵合金，而從陽極極化以及SEM的結果，亦可明顯看出加工量較高者之高熵合金抗孔蝕能力性質為最佳。AlCrFeMnNi高熵合金於含有氯鹽或酸性環境中，合金中的Al成份易與溶液作用而造成腐蝕破壞，使得試片表面因而產生破壞嚴重的許多孔洞；對於此成份高熵合金欠佳之抗蝕能力，藉由將合金加工量的提高，會有助於表面鈍態膜之完整及保護能力，因而可有效的提升抗蝕能力。此外，此成份高熵合金於氟化鈉溶液中的臨界孔蝕溫度有隨著溶液濃度提高亦隨之升高的現象產生，以及加工量最大者有最高的臨界孔蝕溫度。

關鍵字

高熵合金；臨界孔蝕溫度

並列摘要

This research aims to explore the corrosion behavior and electrochemical properties of the high entropy alloy (HEA) AlCrFeMnNi, to see whether increasing the amount of cold work (0%, 30% and 60%) would increase the pitting corrosion resistance, and to achieve the critical pitting temperature (CPT) of the alloy in a specific aqueous environment containing chloride (Cl-) or fluoride (F-) through increasing the bath temperature (20-90℃). Experiments were conducted separately in sulfuric acid sodium chloride, ammonium chloride and sodium fluoride solutions and the result showed that under the room temperature the type 304 stainless steel showing a better pitting corrosion resistance than the HEA; judging from the anodic polarization curves and SEM observations, higher degree of cold work of the HEA has a better pitting corrosion resistance. Exposing AlCrFeMnNi alloy in acidic or in chloride environment showed that the component Al would easily react with the solution and be damaged by pitting corrosion leaving large amount of pits on the surface of the specimen. In dealing with such HEA it is possible to enhance the surface passivity for corrosion protection by means of increasing the degree of cold work.

並列關鍵字

high entropy alloy ； critical pitting temperature

國際替代計量

高熵合金（Al（下標 5）Cr（下標 12）Fe（下標 35）Mn（下標 28）Ni（下標 20））在不同加工量下之電化學腐蝕性質研究

全文下載

主題瀏覽