Corrosion resistance of Ti-6AL-4V, BT9 titanium alloy materials

Corrosion resistant titanium alloy refers to the corrosion resistant titanium alloy generated by adding trace effective elements.

The corrosion resistance of titanium alloy material is due to the formation of an inactive film (stable oxide film) on the surface, and in the oxidizing acid (nitric acid, etc.) and chlorine-containing ion environment that provides oxygen, it and platinum (platinum) have equal and above superior corrosion resistance. However, in the environment of reducing acids (hydrochloric acid, sulfuric acid, phosphoric acid, etc.), comprehensive corrosion occurs, and in aqueous solutions containing chloride ions, gap corrosion will occur between the flange surface. In this environment, the effective elements that can improve corrosion resistance are platinum group elements P, Pd and Ru, etc., a trace of Pd is added separately, if the use of high-priced Pd is added separately, it is necessary to develop cheap Mo, Ni, Ru, Co, Cr and other complex trace addition of cheap corrosion resistance alloys. The addition of trace elements can form an oxide film and promote the improvement of corrosion resistance.

In terms of strength, it is the same as pure titanium, controlled according to O and Fe, and its processability and welding are the same as that of Murata. Corrosion resistant titanium alloys are mostly developed by domestic processing plants in Japan, and Japan is based on pure titanium, reflecting the main demand for corrosion resistant materials. Most of the corrosion resistant titanium alloys developed are in the JS and ASTM standards and are recognized by the public as general materials.