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Nickel plated copper foil tape with integrated anti-corrosion and magnetic shielding
Copper foil tape is one of the most familiar tools for EMC engineers - it can be applied, compacted, and a shielding or grounding operation can be completed in three seconds. But there is often a problem that is only exposed a few months later: the surface of the copper foil has darkened, and even green patina has appeared.
The chemical properties of copper are relatively active. In humid air, copper reacts with oxygen, water vapor, and carbon dioxide to produce cuprous oxide, cuprous oxide, and even basic copper carbonate. The oxide layer is a semiconductor or even an insulator - it increases contact resistance, destroys the low impedance continuity of the grounding circuit, and leads to a deterioration of shielding effectiveness over time. In humid, salt spray, or industrial polluted environments, this degradation process will significantly accelerate. For communication base stations, automotive electronics, and aerospace equipment that require long-term reliable operation, the risk of "performance degradation after a few months" is unacceptable.
Core proposition:The core question that nickel plated copper foil tape needs to answer is: how to maintain the high conductivity of copper while making the tape withstand the test of time in real engineering environments?
Nickel plated copper foil tape is a metal tape made of high-purity electrolytic copper foil as the substrate, deposited with a nickel layer on the surface through electroplating or chemical plating processes, coated with pressure-sensitive adhesive (conductive or non-conductive) on one side, and compounded with release paper or release film. Its structure consists of four layers:
High purity electrolytic copper (≥ 99.98%) with a thickness of 0.007-0.075mm, providing core functions of conductivity and electrical shielding.
Electroplating a uniform and dense nickel layer to improve corrosion resistance while providing magnetic signal shielding capability.
Non conductive pressure-sensitive adhesive or conductive acrylic adhesive, supporting Z-axis conductivity or insulation bonding.
Release paper or release film, protect the adhesive surface, tear off before use.
The electromagnetic shielding ability of nickel plated copper foil tape comes from the division of labor and cooperation between copper and nickel:
High conductivity copper layer reflects eddy current losses, with a shielding effectiveness of ≥ 80dB between 100kHz-3GHz.
Nickel is a ferromagnetic material that guides and absorbs magnetic field lines, filling the magnetic shielding gap of copper.
Synergy effect:The dual material combination of "copper conductive nickel conductive magnetic" achieves full band electromagnetic shielding, which ordinary copper foil cannot achieve both electrical and magnetic shielding at the same time.
The protective effect of nickel plating on copper foil is the core value that distinguishes nickel plated copper foil tape from ordinary copper foil tape.
In real engineering environments, electronic devices may face various corrosive conditions such as high temperature, high humidity, salt spray, and industrial waste gas. Ordinary copper foil tape is prone to oxidation corrosion in these environments: the formation of an oxide layer on the copper surface increases contact resistance, green copper green further deteriorates conductivity, and the oxide layer forms a high resistance layer between the copper foil and the grounding contact, damaging the low impedance grounding path.
Nickel plating protection mechanism:The nickel plating layer forms a dense metal barrier on the surface of the copper foil, effectively blocking the invasion of oxygen, water vapor, and corrosive media. Compared to pure copper foil, nickel plated copper foil tape is less susceptible to corrosion in complex chemical environments. Meanwhile, nickel plating did not significantly reduce the conductivity of copper - the surface resistance after nickel plating usually remained between 0.05-0.07 Ω.
≥ 60dB@1GHz High end products have a noise level of ≥ 70dB (10MHz – 6GHz) and a wide frequency range of 75dB or higher.
XY direction<0.05 Ω, after nickel plating, 0.05-0.07 Ω, maintaining low resistance. <>
180 ° peel strength of 4-8N/cm (stainless steel substrate), approximately 0.2-1.5kgf/25mm.
Long term temperature range of 120-280 ° C, short-term temperature range of 260 ° C, and some products have a long-term temperature resistance of 280 ° C.
Copper foil 0.007-0.075mm, adhesive 0.015-0.04mm, copper purity ≥ 99.98%.
| performance metrics | typical value |
|---|---|
| Shielding efficiency (@ 1GHz) | ≥60–75 dB |
| Surface resistance (XY direction) | <0.05> |
| Surface resistance after nickel plating | 0.05–0.07 Ω |
| 180 ° peel strength | 4–8 N/cm |
| Long term temperature resistance | 120–280°C |
| Copper foil purity | ≥99.98% |
| characteristic | Nickel plated copper foil tape | Ordinary copper foil tape |
|---|---|---|
| Copper foil surface conductivity | conduct electricity | conduct electricity |
| Corrosion resistance | Excellent (nickel layer protection) | Poor (copper is prone to oxidation) |
| Magnetic shielding capability | Yes (nickel layer magnetic conductivity) | None (non-magnetic copper) |
| Shielding effectiveness | Full band (electromagnetic) | Mainly based on electrical signals |
| Long term reliability | tall | Deterioration over time |
| typical scenario | High reliability, harsh environment | Short term/indoor applications |
Core Differences:Nickel plated copper foil tape simultaneously solves copper oxidation corrosion and magnetic shielding short board, and its long-term reliability is irreplaceable.
Internal EMI shielding for mobile phones, tablets, base stations, etc., with a shielding effectiveness of ≥ 70dB (10MHz – 6GHz) for 5G communication equipment.
The car's electronic control, sensors, and engine compartment are exposed to high temperature, high humidity, and salt spray environments, with obvious advantages in corrosion resistance.
Satellite RF components, engine sensors, with electric field shielding ≥ 35dB and magnetic field shielding ≥ 28dB at 1GHz.
Medical device connecting wires ensure stable and reliable signals that meet biocompatibility requirements.
Conductive adhesive version (such as 8099NC) achieves Z-axis conductivity; The non-conductive adhesive version (such as 8099N) is insulated on the adhesive surface.
For regular use, select ≥ 60dB; for high requirements such as 5G, select ≥ 70dB products.
Conventional long-term 120 ° C, short-term 260 ° C; high-temperature models long-term 280 ° C.
Nickel plating protection is required in humid, hot, and salt spray environments, with a uniform and dense nickel layer being the key.
0.007-0.075mm optional, thin and flexible, thick with high mechanical strength.
The essence of nickel plated copper foil tape is to establish a unified material solution between the high conductivity of copper and the high corrosion resistance of nickel. It is not using nickel to "replace" copper, but using nickel to "protect" copper - building a dense anti-corrosion barrier on the surface of copper foil, while allowing nickel's magnetic conductivity to compensate for copper's shortcomings in magnetic shielding.
Copper is responsible for electrical signal shielding and conductive connections, while nickel is responsible for corrosion protection and magnetic signal shielding - the two complement each other in the same material system. The synergistic effect of this "copper conductive nickel protection" makes nickel plated copper foil tape a reliable and validated choice in engineering scenarios that require balancing conductivity, shielding effectiveness, and long-term weather resistance.
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