Abstract: This study proposes the optimal type and ratios of acid/inhibitor as the pickling solutions from tropeolin OOO, cupferron and thiourea. The inhibitors and their action principles were respectively investigated through weight-loss method, scanning electron microscopy, metallographic microscopy, electrochemical method, contact angle and surface tension measurement, infrared spectroscopy. Results indicated that, tropeolin OOO has the most qualified inhibition effect amongst the above-mentioned three inhibitors, owning to its considerable hydrophobic film through the effect of poly-centric adsorption when the ratio of hydrofluoric/nitric acid approaches 1∶37.5. In addition, the increase of tropeolin OOO concentration can help to achieve enhanced inhibition performance, which makes it capable of guaranteeing a minimum weight-loss of 5.5 mg/cm2 and a maximum inhibition ratio of 79% at the concentration of 1.2 mmol/L. Besides, tropeolin OOO packs the metal surface via a multi-center adsorption mechanism and forms a layer of large-area hydrophobic film that can resist more solution with higher tropeolin OOO concentration. Moreover, the surface tension firstly decreases linearly as the inhibitor concentration increases, and then it approximates a steady value when the concentration reaches CMC (critical micelle concentration). In this case, the inhibitor molecules are adsorbed at a balanced rate and create best inhibition circumstance for Ti-6Al-4V.
杜娟, 刘青茂, 王付胜, 宋肖肖, 胡雪兰. Ti-6Al-4V钛合金在氢氟酸-硝酸体系下的缓蚀行为及机理[J]. 材料导报, 2019, 33(6): 1000-1005.
DU Juan, LIU Qingmao, WANG Fusheng, SONG Xiaoxiao, HU Xuelan. Corrosion Inhibiting Behaviors and Mechanism of Ti-6Al-4V in Hydrofluoric-Nitric Pickling Solutions. Materials Reports, 2019, 33(6): 1000-1005.
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2019, Vol. 33 
