Zirconium Anodic Oxidation Coating and Polarized Light Observation
Zirconium, with its excellent acid, alkali and salt corrosion resistance, plays a vital role in the chemical industry, especially in the acetic acid industry, and has become the preferred material for key parts of chemical equipment. In order to deeply study the performance of zirconium, it is particularly important to accurately observe its microstructure. However, the traditional observation method often causes unclear display of the metallographic structure of zirconium due to improper polishing and corrosion treatment, which brings great trouble to analysis and judgment.
Zirconium Rod
To address this problem, we proposed a new zirconium microstructure observation technology-anodized coating and polarized observation method. This technology effectively solves the problem of difficult to clearly display the metallographic structure of zirconium by cleverly combining the anodized coating process and polarized observation.
Experiment and method
Sample preparation:
A metallographic observation plane is machined on the surface of industrial pure zirconium.
The observation plane is ground using a metallographic grinder and the sand is washed off.
The observation plane is immersed in a chemical polishing solution with a specific ratio for polishing for 5~10 seconds. The polishing solution is a mixture of H2O, HNO3 and HF in a volume ratio of (2~5): (2~5): (1~2).
After polishing, the observation plane was immersed in the corrosion solution for 5-20 seconds. The corrosion solution was also mixed with H2O, HNO3 and HF in a volume ratio of (5-10): (2-5): (1-2).
The etched observation plane was used as the anode, the stainless steel plate was used as the cathode, and the sulfuric acid solution was used as the electrolyte. The anodizing treatment was carried out for 3-6 seconds under a 15-25V DC power supply. The volume percentage concentration of the sulfuric acid solution was 2%-5%.
Experimental instruments:
Inverted or upright metallographic microscope equipped with a bright field system and a polarizing system.
Sample observation:
The observation plane after anodizing treatment was placed under a metallographic microscope, and the metallographic structure was observed by polarizing observation.
Results and discussion:
The microstructure of the zirconium sample prepared by this technology was extremely clear and accurate. Compared with the microstructure photographed by the bright field system after traditional mechanical polishing + chemical etching, this technology significantly improved the observation effect. The microstructure displayed by the traditional method is unclear, and it is impossible to conduct effective metallographic analysis and organization determination; while the new technology accurately reflects the metallographic structure of zirconium through anodized coating and polarized observation.
In addition, this technology also has the advantages of simple operation, non-toxicity, and no need for special equipment, which provides strong support for the observation of zirconium microstructure.
Zirconium microstructure observation technology - anodized coating and polarized observation method, successfully solves the problems existing in traditional observation methods and provides a powerful tool for in-depth research on zirconium performance. This technology is not only easy to operate, non-toxic, but also does not require special equipment, and has broad application prospects.
