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Research on Surface Blackening Process and Mechanism of Titanium Alloys

Author: WangYanFeng
Tutor: QuYanPing
School: Shenyang University of Technology
Course: Materials Science
Keywords: Electroless copper plating Electroless nickel plating Directly anodic oxidation Blackenning
CLC: TG174.4
Type: Master's thesis
Year: 2009
Downloads: 76
Quote: 0
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Abstract


The titaniun is a young metal which mounts the world industry stage after the Second World War. It’s a nova in the metal meterial kingdom. The mass fraction of the Titanium in the earth is 0.6 percent. Among the structure metals it is the fouth with good performance and rich reserve, which is arranged only behind the aluminum, the iron and the magnesium. Through the commercial value, the resources life and the prospects of development, it is arranged behind the aluminum and the iron, so it is called the third developing metal. The titanium and its alloy have good compositive performances, such as strong intensity, light weight, good thermal stability, et al. When it is used in plane prodction instead of othe metals, not only may it lengthen the airplane servicing life, but also it may reduce its weight, thus it can enhance the flight performance. Therefore, the titanium is one of the most promising structural materials between the aviation industry and the universe aviation industry. In addition, the titanium and its alloy are also used of the main material of the airship camera. Consequently, it is important to enhance its surface extinction performance. To enhance the extinction rate of titanium surface, this article focuses on the treatment process of surface blackenning on titanium alloy after the electroless copper plating and the electroless nickel plating, and directly anodizing. Through the experiments, I have got a better progresses of the surface blackenning afer electroless copper and electroless nickel, and directly anodizing, which are available for TA15,T3B and TC4 titanium alloy. Put forward a better treatment process. And at the same time, their pre-treatment process is optimized. Using the scanning electron microscope and energy spectrum analysis observes the SEM pattern of the blankening film and analysises its major components. Analysis the composition of the blankening film by XRD detection, by which I explore the mechanism of blankening, and which lays the foundation for the further research in future. The experiment proved that it is difficult to plate nickel directly in the titanium alloy surface. So plating nickel before pre-electroplating nickel.This will not only get a uniform nickel coating, but also solve the problem of binding. the electroless copper blackening process and directly anodic oxidation process after optimising have high-efficiency and simple operation. The blackening film with perfect tinct and none obvious defects is dense and uniform, and the substrate has a good combination between the matrix and the coating.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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