Abstract
The article describes the experience of using phosphate coatings to improve the performance properties of threaded connections of casing pipes. In the course of the work, laboratory and pilot tests were carried out. Using the tools of the Lin 6-sigma methodology, the best options were selected at the laboratory stage, the optimal component composition of the phosphating solution for production was determined, which ensures the production of a coating with the best extreme pressure properties. According to the results of the work, a level of properties of phosphate coatings has been achieved, which allows for repeated assembly of threaded connections of casing pipes while maintaining technical characteristics. Repeated assembly has been confirmed during production tests in the factory.
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