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Nickel plated copper foil tape with integrated anti-oxidation and magnetic shielding
Copper foil tape is one of the most familiar tools for EMC engineers - tearing off release paper, sticking it on, compacting it, and completing a shielding or grounding operation in three seconds. But there is often a problem that is only exposed after the equipment has been running for several months: 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 form 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 scenarios such as 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. 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?
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?
The structure of nickel plated copper foil tape consists of four layers: copper foil substrate layer, nickel plating layer, adhesive layer, and release layer.
High purity electrolytic copper (≥ 99.95%) with a thickness of 0.018-0.075mm, 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:
The high conductivity copper layer reflects eddy current losses, with a shielding efficiency of ≥ 60dB (@ 1GHz), and can reach 70-100dB at 10MHz to 3GHz.
Nickel is a ferromagnetic material that guides and absorbs magnetic field lines, filling the magnetic shielding gap of copper. Copper conductive nickel magnetic conductive achieves full band shielding.
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:The nickel plating layer forms a dense metal barrier, effectively blocking oxygen, water vapor, and corrosive media. The nickel layer can withstand salt spray testing for ≥ 24 hours (partially ≥ 72 hours), while the surface resistance remains at 0.05-0.07 Ω after nickel plating, balancing corrosion resistance and conductivity.
Only one side of the copper foil is nickel plated, which is lower in cost and suitable for general corrosive environments. Adhesives can be applied to nickel plated or non nickel plated surfaces.
Both sides are nickel plated, providing double-sided corrosion resistance and magnetic shielding, suitable for high reliability scenarios. It is recommended to prioritize nickel plating solutions in salt spray environments, high humidity, or industrial pollution.
≥60dB（@1GHz）， High end products can reach 70-100dB at 10MHz to 3GHz, with a wideband range of>75dB.
Surface resistance<0.05 ω>
180 ° peel strength 4-8N/cm (stainless steel substrate).
Long term 120 ° C, short-term 260 ° C.
Copper foil 0.018-0.075mm, copper purity ≥ 99.95%, total thickness can be customized.
| performance metrics | typical value |
|---|---|
| Shielding efficiency (@ 1GHz) | ≥60 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°C |
| Short term temperature resistance | 260°C |
| Copper foil purity | ≥99.95% |
Conductive adhesive version (Z-axis conductivity) is suitable for double-sided conductive scenarios; Non conductive adhesive version with adhesive surface insulation, suitable for single-sided conductivity.
Single sided nickel plating has low cost, while double-sided nickel plating provides double-sided protection and magnetic shielding, selected according to environmental corrosiveness.
Conventional ≥ 60dB, high requirements select 70-100dB; long-term 120 ° C, short-term 260 ° C, exceeding the evaluation of high-temperature models.
The preferred nickel plating solution is in humid, hot, and salt spray environments, with a uniform and dense nickel layer being the key to protection.
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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