Известия Томского политехнического университета: Инжиниринг георесурсов (Dec 2017)
Study of wetting of aluminum and steel substrates with polyorganosiloxanes in the presence of nitrogen-containing surfactants
Abstract
The relevance of the work is caused by the necessity to develop a new anti-corrosion paints, with increased resource exploitation to protect gas pipelines and wellhead equipment of oil wells from corrosion. The main aim of the study is to increase the service life of silicone coatings based on the study of the influence of nitrogen-containing surfactants on wetting of aluminum and steel substrates in silicon-organic paint materials. The methods used in the study: analysis of surface tension in static mode on the device Rehbinder, on the border of phases - solution of polyphenylsiloxane/water and polyphenylsiloxane/air solution and the contact angle of wetting on the border - solution of polyphenylsiloxane/aluminum/water and polyphenylsiloxane/steel/water solution; photographing the surfaces of the coatings and electrochemical determination of coating porosity. The paper introduces the results of the study of nitrogen-containing surfactants effect on wetting of aluminum and steel substrates with solutions of polyphenylsiloxane. The authors have calculated the change in wetting and shown their influence on porosity of coatings. Introduction of surfactants improves wetting of metal substrates in solutions of polyorganosiloxanes, which is expressed in the change of wetting angle. It is to 22° for aluminum substrate and 32,5° for steel one. Analysis of changes in wetting functioning allows supposing that polyethylenpolyamines demonstrate the greatest wetting activity (if their content in the solution is to 0,5 g/dm3), and low molecular weight amines in more concentrated solutions (with added content more than 0,5 g/dm3). The authors derived the equations describing the effect of additives and polyphenylsiloxane contents on wetting angles and developed the nomograms. The introduction of surfactants causes decrease in porosity and roughness of the surfaces (in 2,5 times).
