How to prevent corrosion of precision metal stamping parts?

As a common accessory in machinery, precision metal stamping parts must strictly require production quality and imperatively improve its anti-corrosion ability.

At present, although the service life of hardware parts is implemented in accordance with industry standards, most accessories can achieve a service life of more than 15,000 times and a 96-hour neutral salt spray test inspection standard. In theory, it should have a service life of more than ten years. However, as a commonly used accessory in medical equipment, discoloration and rough profiles are unacceptable, and rough, rusted, and discolored precision metal stamping parts are also not welcome in the medical industry. It is imperative to improve the corrosion resistance of China metal stamping parts.

Improve the corrosion resistance of ferrous metals

At present, the most widely used materials in China metal stamping parts are carbon steel, such as transmission locks, lining steel, etc. For carbon steel, how to improve corrosion resistance is the key to its service life. Due to frequent exposure to rain and sunlight, the surface of the precision metal stamping parts in contact with the profiles has been severely corroded after less than three years of use in Shanghai. Referring to the relevant information, one of the reasons is that HCL may be released from the surface of the PVC profile under the action of light and heat during the aging process, which has a strong corrosive effect on the galvanized layer. This explains why corrosion occurs on the surfaces in contact with the PVC profile.

precision metal stamping parts

Increase the thickness of the coating

According to the relevant British standards, for the use of the galvanized layer under harsh conditions, in addition to the neutral salt spray test to reach 96 hours, the thickness of the galvanized layer is also required to be no less than 40μm. The current Chinese domestic standards often only consider the salt spray test time, but not the thickness of the coating. For example, the passivation film of precision metal stamping parts is complete and good, and the coating of about 10 μm can pass the 96-hour neutral salt spray test. Once the passivation film of precision metal stamping parts is damaged, it is easy to produce rust. The Chinese electroplating industry generally believes that the 96-hour salt spray test is only a test of the protective performance of the galvanized passivation film. In addition, the thickness of the galvanized layer is divided into three grades according to the use environment: excellent environment, general environment, and harsh environment. The thickness of the galvanized layer is 61 μm, 121 μm and 24 μm respectively.

On the whole, China can only be called a big country in the production of precision metal stamping parts processing molds and cannot be called a strong production country. There is still a 10-15 year gap between products and developed countries. host. With the improvement of the quality of precision metal stamping parts, the requirements for mold quality and life are getting higher and higher. The most effective way to improve the mold quality and life of precision metal stamping parts is to develop and apply new mold materials and new thermal and surface treatment processes to continuously improve performance and process performance.

The precision metal stamping parts produced by Zhongshan Yingyun Hardware meet the industry production standards, the production materials are strictly controlled, the production process is strictly required, and high-quality after-sales service is provided, customers can rest assured.


Yingyun Hardware

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