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Thread: Kasenit and phosphate finishing

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    Self-Proclaimed Armorer bloodsport2885's Avatar
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    Default Kasenit and phosphate finishing

    Ive seen a few people recomend kasenit as a way to treat the entire receiver after heat treating the pin holes, but does the phosphoric acid affect the case-hardening layer on the outside of the metal? Would it still be worth it to case harden the receiver and then parkerize it or use KPHOS?

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    Gunco Veteran Toten Kopf's Avatar
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    I have never heard of anyone using Kasenit to harden the entire receiver. I don't think it would be a good idea. The only area that really needs hardening is the FCG holes (I also do the small selector hole).

    The phosphate solution won't do anything to the heat treated areas.

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    Self-Proclaimed Armorer bloodsport2885's Avatar
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    Case Hardening Treatment

    The use of a case hardening (aka surface hardening) compound such as Kasenit can be used to case harden the steel. This basically "coats" the steel with a layer of material that bonds to the steel and forms a tough shell, with the softer steel encased within this "coating".

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    Gunco Veteran Toten Kopf's Avatar
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    Yes, that's why you bead/sand blast the entire receiver after heat treating to provide the phospahte an even surface to attach itself to. The phosphate bonds to the metal so when you Kasenit something, it's still metal, just that the Kasenit hardens the metal maybe .002- .003 " deep. It isn't a coating like paint.

    What you need to do to see for yourself is to use Kasenit on some metal, bead/sand blast then phospahte. This way you'll see for yourself that the Kasenit has no effect on the application of phosphate.

    Now if you don't bead/sand blast after using the Kasenit, then phosphate you'll see that the phosphate will be blochy especially around the heat treated areas.

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