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    Surface Preparation of Galvanized Steel Surfaces

    Uploaded by

    Fernando Alvarenga
    The technical bulletin provides surface preparation and coating recommendations for hot-dipped galvanized surfaces in non-immersion service. It recommends using Tnemec Series 115/V115 primer at 2.0 to 4.0 mils DFT for interior dry/benign exposures, and using Series 115/V115 primer and finish coats at a total thickness of 4.0 to 8.0 mils DFT for moderate interior exposures. For all other exposures and when using epoxy coatings, it recommends sweep blasting to 1.0 to 2.0 mil profile and using various Tnemec prime and finish coats at a total thickness of 4.0 to 6.0 mils DFT.

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    © All Rights Reserved
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    Surface Preparation of Galvanized Steel Surfaces

    Uploaded by

    Fernando Alvarenga
    43 views2 pages
    The technical bulletin provides surface preparation and coating recommendations for hot-dipped galvanized surfaces in non-immersion service. It recommends using Tnemec Series 115/V115 primer at 2.0 to 4.0 mils DFT for interior dry/benign exposures, and using Series 115/V115 primer and finish coats at a total thickness of 4.0 to 8.0 mils DFT for moderate interior exposures. For all other exposures and when using epoxy coatings, it recommends sweep blasting to 1.0 to 2.0 mil profile and using various Tnemec prime and finish coats at a total thickness of 4.0 to 6.0 mils DFT.

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    Procedure to perform surface preparation of galvanized steel before applying coating system

    Original Title

    Surface preparation of galvanized steel surfaces

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    The technical bulletin provides surface preparation and coating recommendations for hot-dipped galvanized surfaces in non-immersion service. It recommends using Tnemec Series 115/V115 primer at 2.0 to 4.0 mils DFT for interior dry/benign exposures, and using Series 115/V115 primer and finish coats at a total thickness of 4.0 to 8.0 mils DFT for moderate interior exposures. For all other exposures and when using epoxy coatings, it recommends sweep blasting to 1.0 to 2.0 mil profile and using various Tnemec prime and finish coats at a total thickness of 4.0 to 6.0 mils DFT.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    43 views2 pages

    Surface Preparation of Galvanized Steel Surfaces

    Uploaded by

    Fernando Alvarenga
    The technical bulletin provides surface preparation and coating recommendations for hot-dipped galvanized surfaces in non-immersion service. It recommends using Tnemec Series 115/V115 primer at 2.0 to 4.0 mils DFT for interior dry/benign exposures, and using Series 115/V115 primer and finish coats at a total thickness of 4.0 to 8.0 mils DFT for moderate interior exposures. For all other exposures and when using epoxy coatings, it recommends sweep blasting to 1.0 to 2.0 mil profile and using various Tnemec prime and finish coats at a total thickness of 4.0 to 6.0 mils DFT.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    Technical Bulletin No.

    10-78 R2
    September 2020

    T N E M E T E C H
    SUBJECT
    Surface Preparation and Coating of Hot-Dipped Galvanized (Non-Immersion Service)

    PURPOSE
    To provide Tnemec sales representatives surface preparation and coating recommendations for
    hot-dipped galvanized surfaces in non-immersion service. This Technical Bulletin does not apply
    to “paintable primers”, which are sometimes applied to coil stock. Some, but not all, “paintable
    primers” have been found to be compatible with certain Tnemec Products. Contact Tnemec
    Technical Services for information about compatible “paintable primers,” test results and potential
    testing of untested “paintable primers”.

    GENERAL
    This Technical Bulletin simplifies and standardizes the surface preparation and coating system
    recommendations for hot-dipped galvanized surfaces for non-immersion service.

    There are many types of galvanizing and passivation treatments. For the purposes of this technical
    bulletin, it is to be assumed that all galvanized surfaces are passivated. In general, all galvanized
    surfaces must be clean, dry, and properly prepared prior to coating.

    Coating Galvanizing Using Series 115/V115

    Interior -- Dry/Benign Exposures:

    Tnemec recommends the following surface preparation and coating system when applying
    coatings over galvanized surfaces in dry, benign interior exposures (e.g. Dry goods warehouses,
    gymnasiums, mechanical rooms, hospitals, schools and general office space).

    Surface Preparation: Visible deposits of oil, grease, or other contaminants shall be


    removed as required by SSPC-SP1. Remove any storage stains per
    Section A3 of SSPC-SP16. Galvanized surfaces must be clean, dry,
    and contaminant free prior to application of coatings.

    Prime Coat: Tnemec Series 115/V115 at 2.0 to 4.0 mils DFT. No exceptions.

    Finish Coat (Optional): Tnemec Series 115/V115 at 2.0 to 4.0 mils DFT.

    Total Film Thickness: 2.0 to 4.0 mils or 4.0 to 8.0 mils DFT.

    TNEMEC COMPANY INC. Page 1 of 2


    Technical Bulletin No. 10-78 R2
    September 2020
    Interior -- Moderate Exposures:

    Tnemec recommends the following surface preparation and coating system when applying coatings over
    galvanized surfaces in moderate interior exposures (e.g. Kitchens, pharmaceutical, natatoriums, light
    manufacturing and textile plants).

    Surface Preparation: Visible deposits of oil, grease, or other contaminants shall be removed
    as required by SSPC-SP1. Remove any storage stains per Section A3 of
    SSPC-SP16. Galvanized surfaces must be clean, dry, and contaminant
    free prior to application of coatings.

    Prime Coat: Tnemec Series 115/V115 at 2.0 to 4.0 mils DFT. No exceptions.

    Finish Coat: Tnemec Series 115/V115 at 2.0 to 4.0 mils DFT. No exceptions.

    Total Film Thickness: 4.0 to 8.0 mils DFT.

    Coating Galvanizing Using Epoxies and/or All Other Exposures

    For the best performance, Tnemec recommends the following surface preparation and coating systems when
    applying coatings over galvanized surfaces using Tnemec epoxies and/or all other exposures:

    Surface Preparation: Visible deposits of oil, grease, or other contaminants shall be removed
    as required by SSPC-SP1. Sweep (Abrasive) Blasting per SSPC-SP16 to
    achieve a uniform anchor profile (1.0 to 2.0 mils). Galvanized surfaces
    must be clean, dry, and contaminant free prior to application of coatings.

    Prime Coat: Tnemec Series 27WB, 66, L69, N69, V69, 115, V115, 118, 135 and 1224
    at 2.0 to 3.0 mils DFT.

    Finish Coat: Compatible Tnemec Finish at 2.0 to 3.0 mils DFT.

    Total Film Thickness: 4.0 to 6.0 mils DFT.

    Mock-Up (for all applications over galvanizing)

    Before commencing the coating application, Tnemec recommends that the applicator, with the owners’/
    specifiers’ review and approval, install a mock up or test area of the surface preparation and coating system
    application to show final color, appearance, compatibility, and acceptability of performance.

    After a minimum of 1 week of exposure, perform adhesion testing per ASTM D 3359; Test A (X-Cut) Standard
    Test Method for Measuring Adhesion by Tape Test A minimum adhesion rating of 4A is required on a 0 to 5
    scale, without blasting.

    Immersion Service

    For immersion service, please consult Tnemec Technical Services.

    JG

    TNEMEC COMPANY INC. Page 2 of 2

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