Niobium tungsten alloy pickling straight line which standard

QJ2910-1997. In the process of niobium alloy chemical pickling process, you need to implement the standard QJ2910-1997, the experiment involves non-ferrous metals, non-ferrous metal products, ferrous metals, metal materials testing, medical equipment, welding, brazing and low-temperature welding and other aspects of knowledge. Niobium-tungsten alloy is a niobium alloy formed by adding a certain amount of tungsten and other elements based on niobium, and tungsten and niobium form an infinite solid solution.