The process control of titanium anode manufacturing is a key link to ensure product quality and performance. The following are some main process control points:
- Raw material selection and inspection
High-quality titanium materials should be selected. The purity, grain size and surface state of the materials should meet the processing standards of titanium anodes. Commonly used grades are Gr1 and Gr2 industrial pure titanium.
For the incoming precious metal raw materials, chemical composition inspection is carried out to ensure that their chemical components and contents comply with relevant international standards. - Surface pretreatment
Methods such as sandblasting and grinding, and high-temperature pickling are used to remove the oxide layer and contaminants on the surface of the titanium substrate, so that the surface roughness reaches an appropriate range and the bonding force between the coating and the titanium substrate is increased. - Coating preparation
Control the coating process parameters of the coating. When preparing the coating by the thermal oxidation method, the heating temperature and holding time should be precisely controlled. - Microstructure detection
The microstructure and element distribution of the coating are detected by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), etc. Pores, cracks and other defects in the coating are found in time, and measures are taken to improve the process. - Performance testing
Electrochemical performance tests such as potential, current, and strengthening life are carried out on the fabricated titanium anode. - Quality monitoring and recording
Establish a complete quality monitoring system and record the operation and test results of each process, which is helpful to trace the root cause of product quality problems and provide data support for process improvement.
Rapid Life Test Method by Electrolysis in Sulfuric Acid Solution:
- Principle: The rapid life test method of electrolysis with the anode at a high current density in sulfuric acid solution is adopted. By testing the failure time of the electrode strengthening life test of different tested anodes working in sulfuric acid solutions of the same concentration and temperature under the same current density, the service lives of different electrodes are compared.
- Apparatus: It includes a 500ml beaker, the tested anode (taken from the electrode of the tested equipment and processed. The active coating on the surface of the test anode is retained with an effective reaction area of 1.0cm² ± 5% by using the damage method and mechanical processing method), the cathode (made of 1Cr18Ni19Ti stainless steel or pure titanium. The shape is determined according to the tested anode. The effective conductive area of the cathode should be larger than the effective anode reaction area, and the cathode pole distance is not less than 1cm), a DC constant current power supply with a rated current greater than 5A, a 0.5-level DC ammeter and DC voltmeter, and a constant temperature water bath with precision (the temperature control accuracy of the water bath should be less than ±1℃).
- Steps: Pour the 1.0N H₂SO₄ solution into the beaker, fix and install the electrolytic anode and cathode and completely submerge the effective working parts of the anode and cathode; After the temperature of the electrolyte rises to the specified temperature (such as 40℃), turn on the power supply and adjust the electrolytic current to the specified value, and maintain it constant during the test. During the electrolysis process, add a certain amount of distilled water and H₂SO₄ irregularly to maintain the liquid level and concentration of the electrolyte; Record the electrolysis time, electrolytic current, and electrolytic cell voltage value once per hour; Stop the test when the voltage of the electrolytic cell starts to rise rapidly and significantly. The accumulated electrolysis time from the beginning of the test to the significant rise of the voltage of the electrolytic cell is called the failure time of the strengthening life test of the tested electrode.
