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The Importance Of Surface Preparation Method On The Corrosion Resistance And Mechanical Properties Of Zinc Rich Primers

Picture for The Importance Of Surface Preparation Method On The Corrosion Resistance And Mechanical Properties Of Zinc Rich Primers
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Product Number: 51321-16642-SG
Author: Dr David Morton/ Antoni Prieto/ Tomas Alhambra/ Raquel Morales/ Cristina Juni
Publication Date: 2021
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Surface preparation is a crucial factor to ensure good performance of coating system in an offshore environment. Both substrate cleanliness and surface profile (influence by the shape of abrasive) will improve the adhesion of the primer which has a direct influence on the performance of the coating system. For a highly corrosive offshore environments the industry is specifying zinc rich primers for long service life. This paper will examine the performance of new, activated zinc rich epoxy primers compared to conventional zinc rich epoxy primers on steel prepared to different surface profiles using standard techniques used today. Testing done has been the cyclic ageing according to ISO12944-9 (2018), blister box test according to ISO 6270-1 and the impact test according to ISO6272-1. This testing will show the importance of surface preparation on the ability of the coating system to provide long term corrosion resistance in an offshore environment and on how the choice of zinc rich primer can improve tolerance to poor surface preparation and thus enhance the lifetime of the coating system.

Key words: Surface Preparation, Zinc Rich Primers, Maintenance

Surface preparation is a crucial factor to ensure good performance of coating system in an offshore environment. Both substrate cleanliness and surface profile (influence by the shape of abrasive) will improve the adhesion of the primer which has a direct influence on the performance of the coating system. For a highly corrosive offshore environments the industry is specifying zinc rich primers for long service life. This paper will examine the performance of new, activated zinc rich epoxy primers compared to conventional zinc rich epoxy primers on steel prepared to different surface profiles using standard techniques used today. Testing done has been the cyclic ageing according to ISO12944-9 (2018), blister box test according to ISO 6270-1 and the impact test according to ISO6272-1. This testing will show the importance of surface preparation on the ability of the coating system to provide long term corrosion resistance in an offshore environment and on how the choice of zinc rich primer can improve tolerance to poor surface preparation and thus enhance the lifetime of the coating system.

Key words: Surface Preparation, Zinc Rich Primers, Maintenance

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Effect of Steel Surface Roughness on Coating Performance

Product Number: 51319-12830-SG
Author: Russell Draper
Publication Date: 2019
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This paper describes experimental work investigating the influence of steel surface roughness on the adhesion performance of fusion bonded epoxy (FBE) pipeline coatings. The paper begins with a summary of the standards and methods that can be used to measure surface roughness. Several parameters are used to characterize the roughness of a blast cleaned steel including profile peak height and peak count. Tortuosity and rugosity indicate the proportional increase in steel surface area developed by roughening the surface. Normal pipeline coating industry practice is to specify and control a single roughness parameter termed “surface profile”. It is measured with replica tape and corresponds to the maximum peak-to-valley height.In the experimental work steel panels were abrasive blast cleaned with various steel shot and grit abrasives and the roughness characteristics of the blast cleaned surface were measured with stylus profilometers conventional replica tape and 3D imaging of replica tape.A FBE pipeline coating was applied to the prepared steel panels. The adhesion performance of the FBE coating was evaluated using the following test methods.<ul><li>Hot water immersion adhesion rating per CSA Z245.20 section 12.14 </li><li>Pull-off adhesion strength after hot water soak exposure per ASTM 4541 </li><li>Cathodic disbondment radius at 65 and 80 °C per CSA Z245.20 section 12.8 </li><li>Time before blisters were observed in Atlas Cell per NACE TM0174 modified </li><li>Average blister diameter in Atlas Cell </li><li>Pull-off adhesion strength after Atlas Cell exposure per ASTM 4541 </li></ul>The experimental data were analyzed using statistical techniques to investigate the relationship between the measured surface roughness and the adhesion test results. The adhesion results were found to be positively and linearly correlated with substrate tortuosity and rugosity. Profile peak height and peak count were found to contribute to tortuosity.
Picture for 07006 INORGANIC ZINC PRIMER VS ORGANIC ZINC PRIMER: (an end-user point of view ).
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07006 INORGANIC ZINC PRIMER VS ORGANIC ZINC PRIMER: (an end-user point of view ).

Product Number: 51300-07006-SG
ISBN: 07006 2007 CP
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 In this paper the approach of an Oil Company is demonstrated from the initial choice between different primers: inorganic zinc and organic (epoxy) zinc., to all the preliminary pre-qualification tests, the subsequently field test performed, and the procedures adopted, costs included.
Picture for Crack Resistance Improvement of Inorganic Zinc Rich Paint
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51313-02415-Crack Resistance Improvement of Inorganic Zinc Rich Paint

Product Number: 51313-02415-SG
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