The 3M presented the results of a laboratory evaluation of the effect of conditions of preparation of steel surface of oil and gas pipelines on the functional properties of powder epoxy coatings. Joint research key market players, companies VNIIGAZ, CHTPZ, 3M and WINOA showed that better results of adhesion after soaking and cathodic exfoliation is provided an acid wash of the surface. The results were presented at the XV International scientific and practical conference oil and gas professionals and oil and gas companies “the State and prospects of application of protective coatings to equipment and structures oil and gas sector» in Moscow.
an Important part of the life of pipe products-surface preparation before coating. Often, the surface preparation remains the given technological conditions, and to pass the qualifying test companies are forced to resort to chemical treatment of the surface. The standards define the requirements for the degree of cleaning, surface profile, dust, salt content, and oil contamination. To improve the surface characteristics, different methods are used – chromate, distilled water treatment under pressure, acid wash, etc.
Chromate remains in Russia no alternative solution for leveling the source of poor surface quality and inadequate conditions for the maintenance and control of a number of other technological parameters of the process of the application of powder epoxy coatings. However, the toxicity of chromium compounds and the presence of controversial technological aspects leads to necessity of search of new solutions to ensure and control the preparation of the surface.
Modern brand epoxy powder coatings, such as ScotchkoteTM 6233P, provide superior values of these key indicators as the peeling of the coating during the cathodic polarization, adhesion after soaking in hot water, etc. some companies use coatings of new generation allows to exclude the operation the application of a chromate surface treatment, while ensuring compliance with the requirements of specifications of major companies operating pipelines in Russia – JSC «Gazprom”, OJSC “Transneft”, OJSC “Rosneft”, OJSC “LUKOIL” etc.
“Speaking on the assessment requirements of the surface and its preparation, should take into account only the characteristics of the coating is not always possible to achieve the required specifications. You need to take a closer look at the quality of the surface and apply additional technological measures of control and security. Chromate is banned in many countries and is not the best way to improve the surface of steel as from a technological point of view, there is, in terms of providing the best qualitative characteristics of the coating system. The industry companies need to invest in the development of objective methods for the monitoring and quality assurance in pursuit of achieving the best performance characteristics of anti-corrosion coatings», - said Viktor Belousov, technical Director of 3M's electronics and energy direction.
Conference on the protective coatings was carried out on the basis of Gubkin Russian state University of oil and gas (national research UNIVERSITY) named after I. M. Gubkin and brought together about 150 specialists of the leading oil and gas companies as PJSC «NC «Rosneft» and JSC «AK «Transneft”, OJSC “LUKOIL”, OJSC “company”, OJSC “Surgutneftegaz”, JSC “KazMunaiGas”, as well as manufacturers of pipes, protective coatings, Contracting and construction companies, research institutes. The main theme this year was energy efficiency and reliability of technical systems for oil and gas production, reduce the cost of their construction and operation.