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  • 1.  HCRP thermal spray

    Posted 07-01-2022 11:34
    A specification calls for HCRP wear resistant coating to a 304 stainless steel surface. I cannot find a definition of HCRP. Chrome oxide HVOF and plasma are popular in our industry, so could it be hexavalent chromium free plasma?

    John Merrill
    Principal Engineer
    Matthews NC
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  • 2.  RE: HCRP thermal spray

    Posted 07-02-2022 21:01

    I have no clue what that acronym stands for.  Can you share what specification referenced in the message?

    Maybe someone on the HVOF from ASTM may have an answer.

    Emil J Lesner
    Sr. Materials Engineer
    Collins Aerospace

    Emil Lesner
    Senior Metalerials Engineer
    Collins Aerospace
    Fletcher OH
    (937) 541-6201

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  • 3.  RE: HCRP thermal spray

    Posted 07-03-2022 03:04
    Hi John,
    HCRP = Hard chrome replacement
    It means you have to use a wear resistant coating which is not hard chrome plating.
    WC HVOF coating or Cr2O3 are among the most famous replacements of Hard chrome plating.


    Masih Ghorbanalinejad
    Thermal Spray Specialist
    Surrey BC
    +1 604 704 0637

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  • 4.  RE: HCRP thermal spray

    Posted 07-03-2022 13:57

    Dear John, 

    Its mean not a hard chrome but it's a replacement of hard chrome, As described by Masih above it's generally Tungsten Carbide Coating applied by HVOF thermal spray process and Ceramic ChromeOxide-Cr2O3 Coating applied by APS process. 

    All content which has Cr and WC are known as carcinogenic powder as Cr become hexavalent chrome after atmospheric oxidation which is define as carcinogenic powder. But you may refer MSDS of powder for better understanding of use. 

    Kind Regards 
    Chirag Raval 

    Chirag Raval - M.Engg. in Met. & Mate. Engg.
    Thermal Spray Applications & Know How Technology Transfer

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