The surface treatment technology of magnesium forgings of construction machinery is of great significance for improving product quality, prolonging service life and enhancing corrosion resistance. The following are several common surface treatment techniques and evaluation methods:
- Anti-corrosion coating: A protective coating is formed on the surface of magnesium forgings by means of electroplating, spraying or impregnation to increase its corrosion resistance. The evaluation method includes checking the adhesion, corrosion resistance and wear resistance of the coating.
- Anti-oxidation treatment: Through chemical oxidation, anodic oxidation or thermal oxidation, a dense oxide film is formed on the surface of magnesium forgings to improve its oxidation resistance. The evaluation methods mainly include measuring the thickness, hardness and corrosion resistance of the oxide film.
- Surface sandblasting/shot blasting: high-speed sandblasting or shot blasting equipment is used to spray abrasive particles onto the surface of magnesium forgings, remove oxide, dirt and surface burrs, and improve its surface quality and finish. The evaluation methods include surface roughness test and appearance inspection.
- Mechanical processing: mechanical methods such as cutting, grinding or polishing are used to process the surface of magnesium forgings to remove burrs and improve flatness and finish. The effect evaluation method includes measuring the surface roughness, flatness and gloss after machining.
- Chemical treatment: such as pickling, alkali washing or electrolytic polishing, can remove surface oxides, grease, dirt, etc., and improve the roughness and cleanliness of the surface. The evaluation methods mainly include checking the surface cleanliness and adhesion after chemical treatment.
In the selection of surface treatment technology, it is necessary to consider the material, shape complexity, required corrosion resistance and aesthetics of magnesium forgings. At the same time, in order to evaluate the surface treatment effect, laboratory testing, appearance inspection and performance tests can be used to verify whether the surface treatment technology has achieved the expected effect.
