Повышение надежности антикоррозионных покрытий для защиты объектов магистральных нефтепроводов с использованием механизма управления качеством

The problem of improving the quality of anticorrosive coatings used at hazardous production facilities, including main oil and oil-products pipelines, is relevant both for pipeline system operators and for manufacturers of materials and equipment. Its solution is facilitated, among other things, by the improvement of the compliance evaluation system for this type of product, which is the subject of consideration by the authors of this article. The purpose of the article is to analyze the compliance evaluation system of anticorrosive coatings used at the facilities of main pipelines operated by the entities of the Transneft system. As part of the paper, the main criteria for evaluation of the compliance of anticorrosive coatings used to protect the surface of tanks, pipelines, structures and equipment of aboveground arrangement are analyzed. The main requirements of national, international and industry standards for environmental conditions and surface preparation for anticorrosion treatment, the quality of the cured coating are considered. An integrated approach to the compliance evaluation of anticorrosive coatings is presented, which makes it possible to improve the quality control of this type of product throughout the product life cycle. Проблема повышения качества антикоррозионных покрытий, применяемых на опасных производственных объектах, в том числе магистральных нефте- и нефтепродуктопроводах, актуальна как для операторов трубопроводных систем, так и для производителей материалов и оборудования. Ее решению способствует в том числе совершенствование системы оценки соответствия данного вида продукции, что является предметом рассмотрения авторов настоящей статьи. Цель статьи – анализ системы оценки соответствия антикоррозионных покрытий, используемых на объектах магистральных трубопроводов, эксплуатируемых организациями системы «Транснефть». В рамках работы проанализированы основные критерии оценки соответствия антикоррозионных покрытий, применяемых для защиты поверхности резервуаров, трубопроводов, конструкций и оборудования надземного исполнения. Рассмотрены основные требования национальных, международных и отраслевых стандартов к условиям окружающей среды и подготовке поверхности к антикоррозионной обработке, качеству отвержденного покрытия. Представлен комплексный подход к оценке соответствия антикорозионных покрытий, позволяющий усовершенствовать контроль качества данного вида продукции на всех стадиях жизненного цикла.

Research progress of microcapsule self-healing anticorrosive coatings

During the long-term use of the coating, environmental factors, physical damage or other factors may cause micro-cracks in the coating. The expansion of microcracks will destroy the overall structure of the coating, reduce the protective effect of the coating and degrade its mechanical properties. However, the traditional repair methods need to consume a lot of manpower and material resources, and the micro-cracks in the coating are difficult to be repaired by the traditional external means. Inspired by biological systems, intelligent coatings with certain self-healing ability have attracted wide attention in academia and industry. According to the different remediation agents used in self-healing micro capsules, several common self-healing coating systems of micro capsules were analyzed, including corrosion inhibitor system, capsule drying oil system, capsule reactive repair agent system, etc.

Synergistic effect of polybenzoxazine/ZrO2 encapsulated polyurethane nanocomposite coatings for enhanced barrier properties of steel in seawater

Purpose The purpose of this study is to use polybenzoxazine (Pbz) functionalized ZrO2 nanoparticles to synthesize polyurethane (PU)-PbZ/ZrO2 nanocomposite. The results derived from the electrochemical impedance spectroscopy (EIS) and polarization studies indicated the superior anticorrosive activity of PU-Pbz/ZrO2 nanocomposite coatings compared to those of plain PU coatings. The decreased corrosion current was detected on the scratch of the PU-Pbz/ZrO2 nanocomposite-coated mild steel surface by scanning electrochemical microscopy (SECM) compared to other studied coatings. The superior anticorrosive and mechanical properties of the proposed nanocomposite coatings provide a new horizon in the development of high-performance anticorrosive coatings for various industries. Design/methodology/approach The Pbz functionalized ZrO2 nanoparticles were characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX) and thermogravimetric analysis (TGA) in terms of the structural, morphological and thermal properties of these coatings. A different formulation of coatings such as PU, PU-Pbz, PU-ZrO2 and PU-Pbz/ZrO2 were prepared and investigated for their corrosion protection performance on mild steel in natural seawater by electrochemical techniques. The surface morphological studies were done by SEM/EDX and XRD analysis. Findings The superior anticorrosive property of the proposed nanocomposite coatings provides a new horizon in the development of high-performance anticorrosive coatings for various industries. Addition of Pbz wrapped ZrO2 nanoparticles into the PU coating resulted in the blockage of charge transfer at the metal/electrolyte interface, which reduced the dissolution of mild steel. It was revealed from the SEM/EDX analysis that the formation of the corrosion products at the metal/electrolyte interface behaved as the passive layer which reduced the dissolution of steel. Originality/value The inclusion of polybenzoxazine functionalized ZrO2 nanoparticles to the polyurethane coating reinforces the barrier and mechanical properties of PU-Pbz/ZrO2 nanocomposite, which is due to the synergistic effect of ZrO2 and Pbz.

Enhancement of Anticorrosive Performance of Renewable Cardanol Based Polyurethane Coatings by Incorporating Magnetic Hydroxyapatite Nanoparticles

The present investigation demonstrates renewable cardanol based polyol for the formulation of nanocomposite polyurethane (PU) coatings. The functional and structural features of cardanol polyol and nanoparticles were studied by FT-IR and 1H NMR spectroscopic techniques. The magnetic hydroxyapatite nanoparticles (MHAP) were dispersed in PU formulations to develop nanocomposite anticorrosive coatings. The amount of MHAP in PU formulations was varied from 1-5%, increase the percentage of MHAP increases the anticorrosive performance as examined by immersion and electrochemical methods. The nanocomposite PU coatings shows good coating properties viz., gloss, pencil hardness, flexibility, cross-cut adhesion and chemical resistance. Additionally, the coatings also studied for surface morphology, wetting, and thermal properties by scanning electron microscope (SEM), contact angle, and thermogravimetric analysis (TGA), respectively. The hydrophobic nature of PU coatings increased by addition of MHAP and optimum result (1050) was observed in 3% loading. The developed coatings revealed hydrophobic nature with excellent anticorrosive performance.