Selecting the proper protective coating is essential when components are to be utilised under harsh conditions. Cadmium and zinc nickel plating are both used to enhance corrosion resistance and improve wear performance in high wear applications. Even though the two materials have similar functionalities, they have different functionalities, uses, and environmental implications.
Performance and Protective Properties
Cadmium plating has excellent corrosion resistance, natural lubricity, and good electrical conductivity. Like tin, cadmium is also very effective in saltwater or marine environments because it will corrode before the base metal does. This self-sacrificing quality makes it useful, though cadmium is relatively soft, so its performance is limited at high temperatures.
Zinc nickel plating has comparable corrosion resistance to zinc but is much tougher and has higher heat resistance. This makes it suitable for components that will be used in high-heat or high-stress applications. It also provides more even coverage across complex shapes without the need for any ongoing maintenance to prevent wear spots.
For more information about zinc nickel plating, consider contacting a specialist such as www.swmf.co.uk/surface-coatings/zinc-nickel-alloy-plating/.
Environmental and Regulatory Considerations
Environmental impacts represent another differentiating characteristic of these types of finishes. Cadmium is toxic, and its use is heavily restricted or banned in various regions. In Europe, for example, cadmium use is all but banned, with a few exceptions that only apply to specific aerospace uses.
Typical Applications
Cadmium is still used where prior approvals still apply, such as in aerospace assemblies. Zinc nickel plating is increasingly used for automotive, aerospace and industrial components worldwide.
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