Investigation on a New Combined Process of Preparing Al2O3 Coatings on Inner-face of TA1 Pipe-fittings with Complicated Shape

Abstract

Abstract:

A new combined process of preparing the Al₂O₃ coatings on the inner surface of TA1 pipe-fittings with complicated shape was developed to improve the resistance of scouring abrasion and corrosion of substrate. The new process mainly included explosive welding, plastic forming and micro-arc oxidation. The phase composition and topography of Al2O3 coatings were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),respectively.Bonding strength, corrosion resistance and anti scouring property of the coatings were also measured.The results indicate that the coatings are composed of γ-Al₂O₃ and α-Al₂O₃with the thickness of 40μm and 10μm,respectively. The bonding strength can reach 55N between the prepared Al₂O₃ coatings and TA1 substrate.The corrosion current of coatings is 5 orders of magnitude lower than that of TA1 substrate.In addition,the Al₂O₃ coatings can protect substrate from scouring abrasion effectively.

Key words: clad tube, explosive welding, plastic forming, micro-arc oxidation, Al₂O₃ coating

摘要：

为提高钛管件的耐腐蚀性能及抗冲刷磨损性能，研究了在具有复杂形状钛管件内表面制备氧化铝陶瓷涂层的新方法。先通过爆炸焊接制备了Ti/Al双金属复合管，再将其成形为复杂管件，接着通过微弧氧化将复合管件的铝层进行陶瓷化处理，从而将铝层部分转化为氧化铝层。采用XRD、SEM对氧化铝层的相组成及形貌进行了分析，并对氧化铝层与基体的结合强度、耐腐蚀性能和耐冲刷性能进行了表征。结果表明：涂层主要由γ-Al₂O₃及α-Al₂O₃组成，其中γ-Al₂O₃的厚度约为

40μm，α-Al₂O₃的厚度约为10μm;陶瓷涂层与基体结合力达55N，涂层腐蚀电流比钛基体降低5个数量级。另外，氧化铝陶瓷涂层可以有效地防护基体被冲刷。

关键词:

双金属复合管, 爆炸焊接, 塑性成形, 微弧氧化, 氧化铝涂层

CLC Number:

TG174.453

GUO Xun-Zhong-1, DAO Jie-1, HONG Chao-1, TANG Qiao-Sheng-2.

Investigation on a New Combined Process of Preparing Al2O3 Coatings on Inner-face of TA1 Pipe-fittings with Complicated Shape

[J]. China Mechanical Engineering, 2011, 22(20): 2498-2502.

郭训忠1, 陶杰1, 汪涛1, 唐巧生2.

复杂形状钛管件内表面氧化铝涂层综合制备新工艺研究

[J]. 中国机械工程, 2011, 22(20): 2498-2502.

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