ASTM A428 Weight of coating on aluminum-coated iron or steel articles

The average coating mass over a particular area of aluminum coated steel or iron article is determined using ASTM A428. Thickness of the coating can also be computed using this method. The test method's final results are expressed in either inch-pound units or SI units.... Read More

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    ASTM A428 test technique establishes a standard for determining the mass of aluminum coatings applied to iron or steel items. Aluminum coatings on iron or steel objects produce a relatively inert barrier that protects the objects against corrosion. A thicker layer will provide more protection against mechanical damage that would otherwise cause the coating to crack.

    Test Procedure:

    In ASTM A428, the aluminum coating from the specimens is removed using a razor blade. Then, the specimens are cleaned by washing them in petroleum ether or another suitable solvent and then weighed. At about 195 °F (90 °C), the specimens are immersed in a NaOH solution. Then, at room temperature, each specimen is immersed in HCl (sp gr 1.18 to 1.19) for no more than 3 seconds after which the specimen is scrubbed with a sponge under running water, then reimmersed in the hot NaOH solution.

    Specimen Size : 

    For ASTM A428, the specimen is created to the measurements specified, with an area of 5.08 in².


    The following formula is used in ASTM A428:

    C= [(W1-W2)/W2]×T×K


    C – mass of the coating 

    W1– original weight

    W2 – weight of the stripped specimen

    T – thickness 

    K – constant


    The average coating mass over a particular area of aluminum coated steel or iron article is determined using ASTM A428.


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