7 8 coil roofing nails

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7 8 coil roofing nails

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7 8 coil roofing nails 7 8 coil roofing nails

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  • Post time: 16-11-22

    7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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  • If the zinc coating is good, but when the light comes out in 3% nitric acid, there is a dark shadow on the coating, and the film is brown when passivation occurs, which may be caused by foreign metal impurities such as copper or lead in the galvanized liquid. When there is a problem in the process of galvanizing, check the temperature and current density first, and then measure and adjust the content of zinc and sodium hydroxide in the bath through the analysis of the bath. Whether DPE levels are low can be determined by Hull cell test.

    7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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  • 7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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  • D, coating adhesion; The zinc layer of the plating parts should be firmly combined with the base metal with sufficient adhesion strength, and will not fall off or bulge after the hammer test.

    7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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  • 7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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  • 7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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  • 7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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    7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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  • 7 8 coil roofing nails

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    7 8 coil roofing nails 7 8 coil roofing nails

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