Abstract
Polymer coatings are one of the most common methods for protecting metal structures from corrosion damage. For example, in the oil and gas industry, polymer coatings are used to protect the inner surfaces of oilfield pipelines. Forecasting the service life of the coating is an unsolved problem. Existing test methods allow to assess the quality of coating application and compliance with the declared properties, for example, resistance at a certain temperature, but do not allow to understand the expected service life or degradation dynamics. One solution to this problem may be the development of existing methods of autoclave testing of coatings with the addition of more criteria for assessing degradation. This paper considers the methodological features of autoclave testing with rapid pressure relief. The decompression autoclave test was considered from the point of view of the principles of its conduct and evaluation of test results. The tests were carried out in environments containing hydrogen sulfide and carbon dioxide. The main object of the tests was anticorrosive polymer powder coatings applied in industrial conditions. The work assessed the influence of the following factors on the test result: pressure relief time, test cycle, and coating quality. Attention was also paid to the evaluation methods; aside from the adhesion assessment, optical microscopy and the evaluation of the microhardness of coatings were used. As a result of the work carried out, it was shown that the pressure relief rate within 5 s affects the test results. An increase in micropores and a drop in the microhardness of coatings after cyclic autoclave tests were also shown. The method of assessing the degradation of coatings using microhardness also showed the convergence of the results with the traditional method of assessing adhesion. The results of the work can be used to modify the autoclave testing method and transition to resource forecasting.
Highlights
In the oil and gas industry, corrosion is one of the major causes of equipment failure.Most of the infrastructure for production and transportation comprises pipelines, so there are many solutions to protect them from corrosion damage [1]
Polymer powder coatings have been used in the oil and gas industry for over 30 years [3], but the issues related to the assessment of their durability under expected operating conditions remain relevant [4]
The conducted studies make it possible to speak about the method of decompression autoclave tests as an effective and operational method for assessing the quality of the application and the declared operational properties of polymer coatings
Summary
In the oil and gas industry, corrosion is one of the major causes of equipment failure.Most of the infrastructure for production and transportation comprises pipelines, so there are many solutions to protect them from corrosion damage [1]. Polymer powder coatings have been used in the oil and gas industry for over 30 years [3], but the issues related to the assessment of their durability under expected operating conditions remain relevant [4]. There is an extensive list of tests to determine the quality of polymer coatings and resistance to aggressive conditions. Tests comprise exposure of coated samples in aggressive solutions at elevated temperatures and climatic tests. The disadvantage of this type of research is its duration. An autoclave test is the option for accelerating research: it combines the effect of temperature, pressure, and an aggressive environment
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