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Zinc plating surface treatment for CNC machined parts

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    Zinc plating, also known as cold galvanizing in the industry, is a process that uses electrolysis to form a uniform, dense, well-bonded anodic metal or alloy deposit layer on the surface of a manufactured part. Compared to other metals, zinc is a relatively inexpensive and easy to coat metal, is a low-value corrosion protection plating, and is widely used to protect steel parts, especially against atmospheric corrosion, and for decorative purposes.

    Types of zinc plating for CNC machined parts

    TypesDescriptionMinimum salt spray time(h)Xavier
    IZinc plating only,no treatment
    IIColored chromate passivation96
    IIIColorless chromate passivation12 
    IVPhonsphate conwersion film 
    VColorless passivation without hwxavalent chromium72
    VIColored passivation without hexavalent chromium120

    Plating environment for each film thickness

    Classification number and conversion coating suffixMinimum thickness of plating(μm)Condition
    Fe/Zn 2525SC4-Very harsh:exposure to harsh conditions or frequent exposure to moisture,detergents and salt water solutions,plus possible damage feom dents,scratches or abrasion.
    Fe/Zn 1212SC3-Harsh: Exposure to condensation, sweat, rain and detergents.
    Fe/Zn 88SC2-Moderate, exposed to dry indoor environments, but occasional condensation, wear and tear.
    Fe/Zn 55SC1-Mild, exposed to indoor atmosphere, with rare condensation and minimal wear.

    Xavier Zinc Plating Capability

    Base material: steel, copper alloy, zinc alloy, stainless steel, aluminum alloy

    Reference standard: ASTM B633;

    Film thickness grade :5μm、8μm、12μm、25μm

    Passivation methods: environmentally friendly: blue and white zinc, colored zinc, yellow zinc, black zinc.

    Non-environmental: military green zinc, white zinc, black zinc.

    Test methods: X-ray spectrometry film thickness test, zinc layer adhesion test, salt spray test, hydrogen embrittlement test.

    Base materialSteel, copper alloy, zinc alloy, stainless steelAluminum alloy
    Maximum processing size(cm)230*50*10050*45*80
    Unit price maximum weight(kg)10040

    Plating layer requirements for CNC machined parts

    • Plating functionality
    • The electroplated zinc layer should meet its functional requirements, including no hydrogen embrittlement, adhesion requirements and corrosion resistance requirements.
    • Thickness uniformity
    • When electroplating zinc there are high and low potentials, the film will be thicker at high potential locations and thinner at low potential locations, affecting the uniformity of the plating thickness. Therefore deposit surfaces where the specified thickness cannot be easily controlled, such as threads, holes, deep recesses, angular bases and similar areas, are usually not subject to minimum thickness requirements.
    • Plating appearance
    • The plating should be smooth in appearance and free from burns, blisters, pits, unevenness, knots, cracks or partial absence of plating, and other defects that may affect its use.

    Case of zinc plating of CNC machined parts

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