passive surface meaning in English

钝化表面
钝化界面

A competition mechanism throughout the tunnel etching of aluminum foils is established in this study , namely , the competition between the attack to passive surface by aggressive anions and the passivation caused by passivators ; dissolution competition between side wall of tunnels and overall surface of foils . to demonstrate the competition mechanisms , the etching conditions influencing the morphology of tunnels , surface modification of foils , redemption and regeneration of passive state were investigated
本文在综述了目前国内外铝阳极箔发展和直流电侵蚀理论的基础上，研究了铝箔侵蚀过程中影响隧道孔形貌和比容的各种因素，揭示了贯穿于整个侵蚀过程的竞争规律，即蚀孔成核竞争? ?铝箔表面的活化与钝化竞争；溶解竞争? ?隧道孔孔壁的溶解与侵蚀箔表面的溶解竞争。