When the molybdenum nut is corroded, targeted measures should be taken according to the type and degree of corrosion. It is necessary to thoroughly remove the corrosion products and restore its original performance and structure as much as possible to avoid further damage to the nut or affect the safety of use due to improper treatment. The cause of corrosion may come from the erosion of acid and alkali substances in the environment, oxidation of humid air or contact with corrosive media. Therefore, the specific situation of corrosion must be clarified before repair to lay the foundation for subsequent treatment.
First, the corroded molybdenum nut should be fully inspected to observe the appearance and distribution range of corrosion. Mild corrosion may only form a thin layer of rust or discoloration on the surface, while severe corrosion may cause pits, loose material and even thread damage. Gently wipe the corroded area with a soft cloth to preliminarily judge the adhesion strength of the corroded products. At the same time, use a magnifying glass to check whether the subtle parts such as the bottom of the thread teeth are corroded. This step can help determine the severity of the corrosion and thus choose the appropriate repair method.
Removing corroded products is the key link in repair. During operation, it is necessary to avoid damaging the nut base. For mild oxidation corrosion on the surface, you can use fine-grained sandpaper or abrasive cloth to gently polish, apply force evenly along the texture direction of the nut, and gradually remove the surface corrosion layer. During the polishing process, wipe it with a clean cloth to observe whether the corrosion is completely removed. If the corrosion is firmly attached, you can first spray a neutral metal cleaner on the corroded area, wait for a while for the cleaner to penetrate and soften the corrosion, then gently scrub it with a soft brush, then rinse it with clean water and dry it thoroughly to prevent residual cleaning agent from causing secondary corrosion.
When corrosion causes deep pits or material damage on the surface of the nut, simple polishing and cleaning cannot restore its performance, and plating repair should be considered. The common method is to form a new layer of molybdenum alloy plating on the surface of the nut by electroplating or chemical plating. The plating can not only cover the defects caused by corrosion, but also rebuild a corrosion-resistant protective layer. Before the coating treatment, the surface of the nut needs to be carefully pretreated, including degreasing, rust removal and activation, to ensure good bonding between the coating and the substrate. The thickness of the coating should be controlled according to the depth of corrosion to ensure that the dimensional accuracy of the repaired nut meets the use requirements.
The assembly link after the repair is completed should also be paid special attention. Improper assembly may destroy the repair effect or accelerate corrosion again. When installing the molybdenum nut, a layer of special anti-corrosion lubricant can be applied to the threaded part. This lubricant can not only reduce the friction resistance when the thread is matched, but also form an isolation film on the thread surface to prevent the invasion of corrosive media. During assembly, the tightening torque should be controlled to avoid cracking of the repair layer or deformation of the nut due to excessive torque. At the same time, ensure that the contact surface between the nut and the connected part is flat and clean to prevent electrochemical corrosion due to poor contact.
The repaired molybdenum nut also needs to take daily protective measures to extend its service life and reduce the risk of corrosion again. When storing, avoid placing the nut in a humid environment with corrosive gas or dust. Use sealed bags or moisture-proof containers to store it. If necessary, put in a desiccant to keep it dry. During use, regularly inspect the appearance of the nut, especially after contact with corrosive media, wipe the surface with a clean cloth in time to remove possible corrosive substances. For molybdenum nuts used in harsh environments for a long time, consider increasing the regular maintenance of the protective coating, such as spraying anti-corrosion paint or passivation treatment.
If the corrosion degree of the molybdenum nut is very serious, there is serious damage to the thread, a large area of loose base material, or critical dimensions are out of tolerance, etc., simple repair may not guarantee its safety of use. At this time, consider replacing a new molybdenum nut. When choosing a new nut, it is necessary to confirm whether its material and anti-corrosion performance meet the requirements of the use environment to avoid rapid corrosion again due to improper materials. In short, the corrosion repair of molybdenum nuts needs to take into account the standardization of technical operations and the adaptability of the use environment. Only through scientific treatment methods and reasonable maintenance measures can its performance be effectively restored and its service life be extended.
