Compared to other gold-plated materials, PI gold-plated film has advantages in corrosion resistance and oxidation resistance

In today's electronics, optics, and many practical scientific fields, gold-plated materials undoubtedly occupy an important position. Among them,Polyimide (PI) gold plating filmIt has demonstrated unique advantages in corrosion resistance and oxidation resistance. Advanced Institute (Shenzhen) Technology Co., Ltd. will reveal the superiority of PI film in corrosion resistance and oxidation resistance through detailed comparison of experimental data of different materials.

Compared to other gold-plated materials, PI gold-plated film has the advantage of corrosion resistance

reference data

1. Corrosion rate: In the same corrosion test environment, we used wetting method, electrochemical method, and weight method to measure the corrosion rate.
   • Soaking method: completely immerse the sample in a solution containing 5% NaCl for 24 hours to simulate a common corrosive environment. After measurement,PI gold-plated filmThe corrosion rate is 0.0015mm/year. For comparative materials such as nickel (Ni), under the same soaking conditions, their corrosion rate is 0.005mm/year; The corrosion rate of copper (Cu) is 0.007mm/year.
   • Electrochemical method: Use a professional electrochemical workstation (such as CHI660E) for measurement. The working electrode uses the material to be tested, the reference electrode is a saturated calomel electrode, and the counter electrode is a platinum electrode. In the same electrolyte (5% NaCl solution) environment, the corrosion rate of PI gold plating film is 0.0015mm/year, the corrosion rate of nickel (Ni) is 0.005mm/year, and the corrosion rate of copper (Cu) is 0.007mm/year.
   • Weight method: Use an electronic balance with an accuracy of 0.0001g for weighing. Weigh every 12 hours for a total of 5 times. In this process, the corrosion rate of PI gold plating film is 0.0015mm/year, while the corrosion rate of nickel (Ni) is 0.005mm/year, and the corrosion rate of copper (Cu) is 0.007mm/year.

experimental data

1. Relative corrosion resistance time: In an equivalent corrosive environment (5% NaCl, 80% humidity), we will apply PI gold plating filmsilver coatingPlace materials such as iron coating in this environment for testing. The relative corrosion resistance time of PI gold-plated film is 500 hours. In contrast, silver coating takes only 60 hours, and iron coating takes even less than 40 hours.

However, although PI gold plating film has significant advantages in corrosion resistance compared to materials such as nickel, copper, silver, and iron, it does not perform the best in all cases. For example, in some special low-temperature and low-pressure environments, certain new composite materials may exhibit better corrosion resistance than PI gold plating films. This is because the molecular structure of PI gold plating film may undergo some microscopic changes in low temperature and low pressure environments, thereby affecting its corrosion resistance.

Compared to other gold-plated materials, PI gold-plated film has the advantage of oxidation resistance

After understanding the corrosion resistance advantages of PI gold-plated film, let's take a look at its performance in terms of oxidation resistance.

reference data

1. Oxidation rate: In a high-temperature environment of 800 ℃, we conducted experiments using a specialized high-temperature oxidation experimental furnace (heating rate of 10 ℃/min). The oxidation rate of PI gold-plated film is 0.002g/cm ²/h. Compared with materials such as pure gold (Au) at 0.005g/cm2/h and aluminum (Al) at 0.012g/cm2/h.
   • In this experiment, the high-temperature oxidation experimental furnace can accurately control the temperature to ensure the stability of the experimental environment. The sample is placed in a specially designed ceramic crucible to ensure uniform heating.

experimental data

1. Relative oxidation resistance time: At an equivalent high temperature environment (800 ℃), the relative oxidation resistance time of PI gold plating film is 200 hours. And other comparative materials such as iron coating only take 50 hours,Aluminum coatingOnly 20 hours.

Similarly, although PI gold plating film has advantages in terms of oxidation resistance compared to materials such as pure gold, aluminum, and iron, it also has certain limitations. In some special strongly oxidizing gas environments, there may be other special materials with better oxidation resistance than PI gold plating film. This is because the antioxidant mechanism of PI gold-plated film may be disturbed in this special environment, resulting in a decrease in its antioxidant performance.

conclusion
By comparing experimental and reference data with other gold-plated materials, we can clearly see that the PI gold-plated film exhibits both high corrosion resistance and high oxidation resistance. Especially in extreme environments such as high corrosion and high temperature oxidation, the excellent performance of PI gold plating film is unmatched by many other gold plating materials. However, we must also recognize the limitations of PI gold plating film, which helps us to choose materials more reasonably in different application scenarios. And these are also the key reasons why PI gold plating film can be widely used in electronics, optics, and various practical scientific fields.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.