本文關鍵詞： Ti-Al-V合金 溴化鋰溶液 溫度 空蝕 影響機理　出處：《中國有色金屬學報》2017年07期 　論文類型：期刊論文

【摘要】：采用三維視頻顯微鏡、粗糙度輪廓儀和電化學測試研究溴化鋰溶液中不同溫度條件下Ti-6Al-4V微觀空蝕形貌、粗糙度以及電化學腐蝕行為,探討溫度對空蝕的影響機理。結果表明:溫度的影響隨空蝕時間增加不斷加強,240 min時最為顯著,之后影響減弱并趨于穩(wěn)定。溫度升高,空泡潰滅產生的微射流沖擊強度增大,使表面鈍化膜更易被破壞,同時腐蝕作用加速了點蝕形成,導致表面局部應力集中和更多電化學電池的產生,從而促進了力學和腐蝕因素,兩者的協(xié)同作用加速了空蝕破壞。空蝕破壞程度在溫度55℃時達到最大值,繼續(xù)升高溫度,腐蝕因素仍被促進,但微射流對表面的沖擊強度減弱,對表面鈍化膜的破壞作用降低,由于力學因素在空蝕中占據(jù)主導地位,因此使空蝕速率得到減緩。
[Abstract]:The micro-cavitation morphology, roughness and electrochemical corrosion behavior of Ti-6Al-4V at different temperatures in lithium bromide solution were investigated by three-dimensional video microscope, roughness profiler and electrochemical measurement. The effect of temperature on cavitation erosion is discussed. The results show that the effect of temperature on cavitation corrosion is the most obvious with the increase of cavitation time, and then decreases and tends to be stable. The impact strength of micro jet caused by bubble collapse increases, which makes the surface passivation film more easily destroyed. At the same time, corrosion accelerates the formation of pitting, resulting in local stress concentration on the surface and the production of more electrochemical cells. Thus the mechanical and corrosion factors are promoted, and the synergistic effect of the two factors accelerates the cavitation damage. The cavitation damage degree reaches the maximum at 55 鈩，

本文編號：1446646