Measurement of adhesion properties between topcoat paint and metallized/galvanized steel with surface energy measurement equipment.
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Measurement of adhesion properties between topcoat paint and metallized/galvanized steel with surface energy measurement equipment.

Filetype[PDF-135.63 MB]

Select the Download button to view the document
Please click the download button to view the document.
Measurement of adhesion properties between topcoat paint and metallized/galvanized steel with surface energy measurement equipment.
  • English

  • Details:

    • Publication/ Report Number:
    • Resource Type:
    • Geographical Coverage:
    • Abstract:
      The objectives of this research project are: (1) Compare the adhesion properties of NEPCOAT-approved topcoat paint over

      metallized or galvanized steel. Use “surface-energy” measuring technique to characterize the wetting properties of the liquid paint

      on the profiled zinc surfaces. Explore correlation between the adhesive strength and the liquid paint wetting properties. As control

      the adhesion properties of topcoat paint over zinc primer painted steel substrates will also be measured. (2) Investigate various

      factors affecting the adhesion of topcoat paint over galvanizing. (3) Report and recommend practices that produce the best adhesion

      of NEPCOAT-approved topcoat paints over metallized and particularly galvanized steel surfaces. We prepared four different types

      of test panels coated with five different commercial paint systems. The paint systems include four systems adapted from the

      NEPCOAT list of intermediate and top paints qualified for bare steel, and one system of epoxy sealer for metallized surface. Four

      types of substrates were used for fabricating the test panels: (1) galvanized steel with mechanical grinding to produce rough

      surface, (2) galvanized steel with blast profiling to produce rough surface, (3) galvanized steel stored indoors for two weeks before

      blast profiling and painting, and (4) metallized steel with inherent roughness due to the thermal spray process. We recorded, as a

      function of time, the contact angle of droplets of freshly prepared liquid paints on the replicas of the substrate used for spray

      painting. The cured test panels were subject to pull-off strength tests according to the ASTM D4541 standard, and the X-cut tape

      tests according to Method A of ASTM D3359 standard. Images of the pull-off test break surfaces were photographed and

      examined. We analyzed the correlation between the pull-off strengths and the contact angles. The correlation provided insight on

      the relative adhesive strengths of the different paint-substrate pairs. We concluded that (1) the NEPCOAT paints could be used for

      galvanized and metallized steel to obtain comparable adhesion performance as that of the zinc-rich organic primer coated steel, (2)

      although the NEPCOAT intermediate paint on the metallized surface has adequate pull-off strength to pass the inspection, it is

      highly recommended that the state DOT specification of the use of sealant is strictly followed, (3) although the exposure to

      atmosphere after galvanizing is commonly recognized as a problem for paint adhesion, we found that a time delay of two weeks

      between galvanizing and profiling/painting is permissible if the galvanized steel is stored in the normal indoor dry atmosphere, (4)

      we think a refined quantitative correlation between pull-off strength and contact angle could be useful for optimizing the paint-tosubstrate


    • Format:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at

    Version 3.23