Abstract
The main purpose of this work is to assess the relevance of the requirements for the quantitative content of water-soluble salts on the metal surface before applying an anti-corrosion coating. To do this, a series of tests are carried out by coating the metal surface of samples with different salt content, followed by aging in distilled water at high temperature and pressure. After exposure, the defects will be analyzed. The results obtained will help to choose the maximum allowable amount of soluble salts on the metal surface, because the internal coating of field pipelines is practically beyond repair, and to fix this value in the regulatory document.
Highlights
Osmotic swelling is one of the most common causes of premature failure of anticorrosive coatings in contact with liquid media at high pressures and temperature
The mechanism of this phenomenon has been studied and is well known, it lies in the fact that if the metal surface before applying the protective coating are water-soluble salts, and the protected object in contact with the liquid medium, the osmosis reaction is triggered
One of the methods of protection against osmotic defects is the strict control of the preparation of the metal surface before applying paint coating
Summary
Osmotic swelling is one of the most common causes of premature failure of anticorrosive coatings in contact with liquid media at high pressures and temperature This is especially true for the oil industry, because still, protective anti-corrosion coating is one of the most popular methods of passive protection of the inner surface of oilfield pipelines and tanks. The source [1] has already said that this problem has been studied for many years by many experts in the field of research of the properties of anticorrosive coatings The mechanism of this phenomenon has been studied and is well known, it lies in the fact that if the metal surface before applying the protective coating are water-soluble salts, and the protected object in contact with the liquid medium, the osmosis reaction is triggered. The fact that the repair of the internal coating of these elements of the underground pipeline, is practically impossible, leads to the fact that it is necessary to revise the old rules and requirements for the cleanliness of the surface in the direction of their tightening
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