(1. 中國科學(xué)院 金屬研究所 中國科學(xué)院核用材料與安全評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室，沈陽 110016；
2. 南方海洋科學(xué)與工程廣東省實(shí)驗(yàn)室（珠海），珠海 519000；
3. 中國科學(xué)技術(shù)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230026)
摘 要: 采用電化學(xué)方法研究了鈦合金ZTi60和鋁合金2024連接后的電偶腐蝕行為，以及控制電偶腐蝕的措施。采用零電阻電流計(jì)(ZRA)測(cè)量電偶電流，極化曲線測(cè)量偶接金屬的極化行為，掃描電鏡(SEM)觀察樣品的腐蝕形貌。結(jié)果表明：陽極金屬2024初期電偶腐蝕輕微，之后腐蝕率逐漸增加并趨于穩(wěn)定，這與鋁合金表面致密鈍化膜逐漸轉(zhuǎn)變?yōu)槭杷僧a(chǎn)物膜有關(guān)。與未偶接的2024相比，電偶腐蝕使鋁合金表面點(diǎn)蝕坑變得更深，但數(shù)量更少。對(duì)陽極2024進(jìn)行防護(hù)比對(duì)陰極ZTi60進(jìn)行防護(hù)抑制電偶腐蝕的效果更好。然而，一旦陽極金屬表面的防護(hù)涂層受損后，受損面積越小，電偶腐蝕的加速作用越明顯。
關(guān)鍵字: 鈦-鋁連接；電偶腐蝕；表面防護(hù)；控制措施；鈍化金屬；涂層受損
（1. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China;
3. School of Materials and Engineering, University of Science and Technology of China, Hefei 230026, China）
Abstract:The galvanic corrosion of ZTi60-Al2024 coupling and its control measures were investigated by electrochemical methods. The galvanic current was measured by zero resistance ammeter(ZRA), the polarization behavior of the coupled metals was detected by polarization curves, and the corrosion morphology was observed by scanning electron microscopy(SEM). The results indicate that the galvanic corrosion of Al2024 anode is slight in the initial stage, and then the corrosion rate increases gradually, finally tends to a stable value, which is related to the transition of dense passive film to loose product film on Al2024 surface. Compared with the uncoupled Al2024, the corrosion pits on the coupled Al2024 are less but deeper. The protection of Al2024 anode can inhibit the galvanic corrosion better than the protection of ZTi60 cathode. However, once the protective coating on the anodic metal is damaged, the smaller the damaged area is, the severer the galvanic corrosion is.
Key words: Ti-Al coupling; galvanic corrosion; surface treatment; control measures; Passive metals; damaged coating
