White Paper: Materials
Overcoming Galvanic Compatibility Challenges in EMI Shielding
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When designing products containing metal components, it is important to consider the effects of corrosion early in the design process. Adopting the appropriate design strategy at the prototype stage will assist in efforts to mitigate the potential impacts of galvanic corrosion especially when engineered products are designed to interface with other systems, technologies and sometimes the environment itself. Download the whitepaper to learn more.
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Overview
The white paper from TE Connectivity addresses the challenges of galvanic compatibility in EMI shielding applications, focusing on the phenomenon of galvanic corrosion. Galvanic compatibility refers to the ability of different metals to coexist in the same system without forming an electrochemical cell in the presence of an electrolyte, such as water. When dissimilar metals are in contact, one metal may corrode preferentially, leading to material loss and potential failure of components.
The paper outlines the mechanisms of galvanic corrosion, which occurs when one metal transfers electrons to another, resulting in corrosion pits and material degradation. Factors that can accelerate this process include elevated temperatures, high humidity, extreme pH levels, and exposure to corrosive substances.
To mitigate the risks associated with galvanic corrosion, the paper suggests several strategies. First, matching the mating metal materials can minimize the electrochemical potential difference, reducing the likelihood of corrosion. Second, employing electrolytic or electroless plating and passivation techniques can protect metal components by coating them with a different metal, thereby reducing their exposure to corrosive environments. These coatings can act as sacrificial layers, corroding preferentially to extend the lifespan of the underlying metal.
The importance of considering galvanic compatibility during the design process is emphasized, as this is when the application environment is best understood. The paper advocates for a thorough evaluation of materials and the implementation of secondary corrosion protection measures to ensure optimal performance in harsh environments.
In summary, the white paper serves as a comprehensive guide for engineers and designers to navigate the complexities of galvanic corrosion, providing practical solutions to enhance the durability and reliability of EMI shielding components in various applications.