Titanium alloy rods are prone to fire and burns, especially titanium sheets. The chemical activity of the titanium alloy bar in the alkaline solution, the high temperature of the entire alkaline solution, or the local temperature of the titanium alloy bar when it is washed in an alkaline solution containing an oxidant are the causes of titanium burns. The results show that there is a battery effect due to the potential difference between the titanium alloy tool and the steel tool in the alkaline solution. When titanium is in contact with steel, a current is formed. The smaller the contact point, the greater the current, and the titanium alloy rod is often burned from the contact point of the two metals.
In order to prevent and reduce the ignition of grade 5 titanium round bar during the alkaline cleaning process, the following measures can be taken:
1. Select a qualified alkaline lotion for composition;
2. Strictly manage and control the temperature of lye;
3. Insulate the alkali washing rack with high-temperature resistant paint or high temperature resistant insulating gasket. For example, the stainless steel alkaline washing rack can be padded with ceramic strips or sheets to separate the titanium material from the steel frame to avoid fire.
In the process of alkaline cleaning of 6al4v titanium alloy bar, the lye is continuously taken away or evaporated by the workpiece, so we need the enterprise to supplement the lye, and conduct analysis and adjustment in a timely manner to keep the composition of the lye relatively stable. During the alkaline washing process, insoluble oxide slag precipitates at the bottom of the tank, which affects the good thermal conductivity of the tank. The gap caused by the precipitation makes the steel tank prone to electrochemical corrosion, which greatly shortens its service life. Therefore, the sludge should be cleaned up in time.
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