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It's a fine thing to get a description of nickel plating. Brings out my inner scientist..
It depends on what type of Nickel is plated. The process we use is an "electroless" process, i.e. not electroplated. As a result the Nickel is plated as a Phosphorus alloy. We can control the amount of phosphorus alloyed with the Nickel. The level of phosphorus dictates the properties. The lower the phos phorus level the higher the hardness. But the higher level phosphorus offers better corrosion resistance. If you heat treat the Nickel you can increase the hardness to that of hard chrome. The pre-treatment regime dictates the adhesion of the plate to the surface you are plating on. The bike I have plated is high phosphorus Nickel and it is very difficult to chip off the Nickel through glancing knocks and blows. Obviously if you hit anything sharp the Nickel layer would be compromised. But certainly the Nickel is harder than powdercoat . I have just looked and powdercoat has a vickers hardness of about 20HV, as plated high Phos Nickel is about 450HV and hard chrome/heat treated Nickel is 1000HV. Hope this helps.
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Dibs. IM coming