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a few of the advantages of electroless nickel over hard chrome are:
En plates to within two ten-thousandths of an inch of the required coating thickness, thus eliminating post grinding operations and cost.
Unlike chroming, en plates by a chemical redox process which provides uniformity to any configuration of substrate, including blind holes, bolt threads, and impellers.
En high phosphorus (enhp) corrosion resistance properties far surpass chrome, as enhp is an amphorus metallic glass and does not have the crystalline structure of chrome. Enhp can withstand 1000 salt spray hours whereas chrome fails within ten hours.
Whereas enhp offers superior corrosion protection in acidic environments, en low phosphorus (enlp) has proven highly resistant in alkaline environments.
En bonding to the part is far superior to chrome, approximately 100,000 - 200,000 psi compared to 40,000 - 60,000 psi for chromes.
En can be heat-treated to produce hardness values equivalent to hard chrome. In lubricated wear applications, en is comparable to hard chrome. In non-lubricated wear applications, a duplex coating of enlp over enhp and/or selective heat treatment has shown improvements over chrome.
En has been used extensively in the oil & gas, automotive, and aerospace industries since 1964.
The future of en will involve the creation of composite chemistries such as electroless nickel boron |
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