Precision Manufacturing and Industrial Application of 50 μ m PI Nickel Plating Film

In the field of flexible electronic materials, polyimide (PI) films with a thickness of 50 μ m have become the core substrate for high-end manufacturing fields such as 5G communication and new energy vehicles due to their excellent high temperature resistance, insulation properties, and mechanical strength. However, the insulation properties of PI film limit its application in scenarios such as conductivity and electromagnetic shielding. By depositing a nickel layer through surface metallization technology, it is possible to retain the inherent advantages of PI while endowing it with new properties such as conductivity and corrosion resistance. Advanced Institute Technology has been deeply involved in this field for many years, producing50 μ m PI nickel plating filmWith precise manufacturing processes and stable performance, it has become a benchmark product in the industry.

Preparation and surface pretreatment of PI film

The surface characteristics of PI film directly affect the adhesion between the coating and the substrate. Advanced Institute Technology adopts a multi-stage cleaning process to remove impurities such as oil and dust on the surface of the film through organic solvents, and then uses plasma treatment technology to activate the film surface. High energy particles in plasma bombard the surface of PI, breaking the chemical bonds in its molecular chains, forming a large number of active sites, while increasing surface roughness, providing mechanical anchoring points for subsequent coatings. Experimental data shows that the surface contact angle of PI film treated with plasma has decreased from 90 ° to below 30 °, indicating a significant improvement in hydrophilicity, which creates conditions for the uniform spreading of electroless nickel plating solution.

Chemical nickel plating: precise control of self catalytic reaction

Chemical nickel plating is one of the core technologies of advanced institute technology. This process does not require external current, and a self catalytic reaction occurs on the surface of PI through a reducing agent (such as sodium hypophosphite) in a nickel salt solution, reducing nickel ions to metallic nickel and depositing it on the substrate. In the plating solution formula independently developed by Advanced Institute Technology, a specific proportion of chelating agents and stabilizers are added, which can control the reduction rate of nickel ions, avoid stress concentration caused by rapid growth of the coating, and prevent precipitation caused by the decomposition of the plating solution. Scanning electron microscopy (SEM) observation shows that the electroless nickel plating layer presents a dense cellular structure with a thickness uniformity of ± 5%, and the bonding strength with the PI substrate exceeds 20MPa, far exceeding the industry standard requirements.

Electroplated nickel: innovative application of conductive seed layer

For application scenarios that require thicker coatings or higher conductivity,Advanced Institute of TechnologyAdopting electroplating technology. Due to the non-conductive nature of PI thin films, a layer of copper or nickel seed layer with a thickness of approximately 50nm needs to be deposited on their surface using magnetron sputtering technology. The seed layer not only provides a conductive pathway for electroplating, but also serves as a buffer layer to reduce the difference in thermal expansion coefficient between the coating and the substrate. During the electroplating process, Advanced Institute Technology optimized the current density distribution and controlled the deposition rate of nickel ions through pulse electroplating technology to avoid uneven coating thickness caused by edge effects. The final formed electroplated nickel layer has fine grains (average particle size<1 μ m) and a low resistivity of 7 × 10 Ω· m, meeting the requirements of high-frequency electromagnetic shielding.

Post processing: a key step in performance optimization

The PI film after nickel plating needs to undergo post-treatment steps such as heat treatment and surface passivation. Advanced Institute Technology adopts segmented annealing process to gradually eliminate internal stress in the coating within the temperature range of 150-250 ℃, preventing coating peeling due to thermal cycling during subsequent use. At the same time, a dense oxide film is formed on the surface of the nickel layer through chemical passivation treatment, reducing the corrosion current density to below 10 ⁻⁶ A/cm ², significantly improving the corrosion resistance of the material in salt spray environment.

Industrial Validation: From Laboratory to Large Scale Production

After a research institute in Guangzhou conducted sample testing at the Advanced Institute of Science and Technology, it50 μ m PI nickel plating filmA rigorous evaluation was conducted. The test content includes key indicators such as coating thickness uniformity, bonding strength, corrosion resistance, and conductivity. The results show that the products of Advanced Institute Technology meet or exceed the expected requirements in all performance aspects. For example, in the salt spray test, the nickel plating film did not show any corrosion phenomenon within 72 hours; In the conductivity test, its resistivity remains stable at around 7 × 10 ⁻⁸Ω· m, meeting the requirements of high-frequency electromagnetic shielding. Based on these test results, the research institute has decided to purchase 50 μ m PI nickel plating film from Advanced Institute Technology for the production of its high-end electronic products.

Advanced Institute Technology provides high-performance nickel plated PI film solutions for fields such as 5G communication and new energy vehicles through precise control of process parameters and deep optimization of material properties. The breakthrough of this technology not only promotes the upgrading of flexible electronic materials, but also provides strong support for the localization of key materials in the high-end manufacturing field.