In order to use Full Threaded Stud better, when we use Full Threaded Stud, we need regular maintenance, such as regular cleaning of Full Threaded Stud, which can improve the efficiency of Full Threaded Stud. But when we clean the Full Threaded Stud, we often find some problems, mainly six common problems.1. Pollution generated during rinsingAfter quenching, the Full Threaded Stud was cleaned with a silicate cleaning agent and then rinsed. XX solid matter appeared on the surface. The infrared spectrometer was used to analyze this substance and it was confirmed to be inorganic silicate and iron oxide. This is due to the incomplete rinsing and the residual silicate on the surface of Full Threaded Stud.2. Unreasonable stacking of Full Threaded StudFull Threaded Stud has signs of discoloration after tempering. Soak it and let it evaporate and find an oily residue, which is a high content of lipids. It shows that the Full Threaded Stud is contaminated by cleaning agent and quenching oil during the rinsing period, and it melts at the heat treatment temperature, leaving chemical burn scars. Such substances confirm that the surface of the Full Threaded Stud is not clean. Analyzed by infrared spectrometer, it is a mixture of base oil and ether in quenching oil. The ether may come from the addition of quenching oil. The analysis results of the quenching oil in the mesh belt furnace confirmed that the Full Threaded Stud was unreasonably stacked during heating. The Full Threaded Stud is slightly oxidized in the quenching oil, but it is almost negligible. This phenomenon is related to the cleaning process, not the quenching oil. The problem.3. Surface residuesThere is a white residue on the high-strength screw, which was analyzed by infrared spectrometer and confirmed to be phosphide. No acid cleaning was performed, and inspection of the rinsing tank found that the tank liquid had a higher carbon solubility. The tank liquid should be poured out regularly, and the concentration level of the lye in the rinsing tank should be checked frequently.4. Alkali burnHigh-strength screws are blackened by quenching heat and have a uniform and smooth oil-black outer surface. But there is an orange XX visible area in the outer circle. In addition, there are slightly light blue or light red areas. The original bar and wire rod are coated with phosphating film to facilitate cold heading and tapping. They are directly heat treated without rinsing, cooled in quenching oil, cleaned with alkaline cleaning agent, blow-dried (not rinsed), tempered at 550\u00b0C, hot After removing the anti-rust oil from the tempering furnace, red spots were found on the screw threads.It has been tested that the red area on the screw is caused by alkali burns. Alkaline cleaning agents containing chloride substances and calcium compounds will burn the steel Full Threaded Stud during heat treatment, leaving marks on the surface of the Full Threaded Stud.Steel Full Threaded Stud cannot remove surface alkalis in the quenching oil, which burns the surface under high-temperature austenite state and aggravates the damage during the next tempering. The recommendation is to thoroughly clean and rinse the Full Threaded Stud before heat treatment to completely remove the alkaline residue that causes the Full Threaded Stud to burn.5. Improper rinsingFor large-size Full Threaded Stud, it is often quenched with polymer aqueous solution. Before quenching, it is washed and rinsed with alkaline cleaning agent. After quenching, the Full Threaded Stud has rusted on the inside. Analysis with infrared spectrometer confirmed that in addition to iron oxide, there are sodium, potassium and sulfur, indicating that the inside of the Full Threaded Stud is stuck with an alkaline cleaning agent, which is likely to be potassium hydroxide, sodium carbonate or similar substances, which promotes its rust. Check the Full Threaded Stud rinsing for excessive contamination. It is also recommended to change the rinsing water frequently. In addition, adding rust inhibitors to the water is also a good way.6. Excessive corrosionHigh-strength Full Threaded Stud often sees some black streaks, and we have also seen in experiments that the Full Threaded Stud before heat treatment has been rinsed with inorganic and organic cleaning agents. After quenching, it is still found that there are still black streaks even before heat treatment. , Will also leave streaks after heat treatment. An infrared spectrometer was used to analyze the contaminants remaining on the surface, and it was found that there were higher concentrations of sulfur and calcium. Using a small amount of acetic acid and isopropanol, fold a small piece of test filter paper on the dark spot and wipe the dark spot on the filter paper. Analysis of the filter paper with infrared spectrometer confirmed that calcium, sulfur, iron, manganese and chromium are the main elements.The presence of calcium and sulfur in China Fasteners rust spots indicates that this substance is a quenching oil that has dried out, and it is also the evolution of gas phases during the quenching process. Because the quenching oil is excessively aging, it is recommended to pour out the old oil, add new oil, and implement process supervision and quenching oil maintenance during the entire process cycle.