scholarly journals Corrosion behavior of duplex polyaniline/epoxy coating on mild steel in 3% NaCl

2005 ◽  
Vol 59 (11-12) ◽  
pp. 317-320
Author(s):  
Milica Gvozdenovic ◽  
Branimir Grgur ◽  
Zorica Kacarevic-Popovic ◽  
Vesna Miskovic-Stankovic

The corrosion behavior and thermal stability of epoxy coatings electrodeposited on mild steel and on mild steel with electrochemically deposited polyaniline (PANI) film were investigated by electrochemical impedance spectroscopy (EIS) and thermo gravimetric analysis (TGA). The aim of the paper was to present new findings on the corrosion protection of mild steel by a duplex PANI/-epoxy coating in 3% NaCI solution and to determine the effect of thin PANI film on the protective properties of the coating. PANI film was deposited electrochemically on mild steel from an aqueous solution of 0.5 mol dm"3 sodium benzoate and 0.1 mol dm"3 aniline at a constant current density of 1.5 mA cm"2. Non-pigmented epoxy coatings on mild steel and on mild steel with PANI film were obtained by cathodic electrode position at constant voltage and stirring conditions. The resin concentration in the electrode position bath was 10 wt.% solid dispersion in water at pH 5.7. The applied voltage was 250 V, the temperature 26?C and the deposition time 3 min. It was shown that thin PANI film could be used to modify the surface of mild steel prior to epoxy coating deposition, due to the increased corrosion protection of a duplex PANI/epoxy coating comparing to an epoxy coating on mild steel in 3% NaCl solution.

2021 ◽  
Vol 158 ◽  
pp. 106376
Author(s):  
Songhua Gu ◽  
Hongwei Shi ◽  
Chunjie Zhang ◽  
Wei Wang ◽  
Fuchun Liu ◽  
...  

Author(s):  
Александр Михайлович Ефремов ◽  
Петр Дмитриевич Волянский ◽  
Павел Олегович Ревин ◽  
Сергей Владимирович Ануфриев

При сооружении трубопроводов в России, странах Европы и Африки наиболее распространенным является применение труб с трехслойными полиэтиленовыми покрытиями. В то же время опыт строительства магистральных нефте- и газопроводов в США, Канаде, ряде других стран свидетельствует о возможности использования эпоксидных покрытий в качестве эффективной антикоррозионной защиты труб. В этой связи была начата научно-исследовательская работа по определению целесообразности применения двухслойных эпоксидных покрытий для антикоррозионной защиты магистральных трубопроводов подземной прокладки, эксплуатируемых организациями системы «Транснефть». Цель настоящего исследования - оценка технической и экономической целесообразности использования эпоксидных покрытий как альтернативы полиэтиленовой изоляции трубопроводов. Были проведены лабораторные исследования образцов трех систем эпоксидных покрытий, осуществлен сравнительный анализ технических свойств эпоксидной и полиэтиленовой изоляции. Установлено, что эпоксидные покрытия превосходят полиэтиленовые по ряду свойств, в частности обладают повышенной стойкостью к температурным воздействиям, УФ-излучению, катодному отслаиванию, а также повышенной механической прочностью, что позволяет обеспечить сохранность покрытия при строительстве трубопроводов методом наклонно-направленного бурения и прокладке в скальных грунтах. Основные мощности по производству сырья для эпоксидных порошковых покрытий локализованы в России, в то время как сырье для полиэтиленовых покрытий в основном производится за рубежом. Установлена экономическая целесообразность применения двухслойного эпоксидного покрытия как альтернативы трехслойному полиэтиленовому покрытию для трубопроводов больших диаметров - более 720 мм. Для внедрения труб с двухслойным эпоксидным покрытием на объектах ПАО «Транснефть» проводится его апробация, включающая строительство опытного участка трубопровода. When constructing pipelines in Russia, Europe, and Africa, it is the most common to use pipes with threelayer polyethylene coatings. At the same time, the oil and gas pipeline construction experience in the USA, Canada, and a number of other countries, as well as the construction of the Zapolyarye - Purpe elevated main pipeline by Transneft PJSC, indicates the possibility of using epoxy coatings as an effective pipe corrosion protection solution. In respect thereof, research study to determine the feasibility of using two-layer epoxy coatings for corrosion protection of underground pipelines operated by the Transneft system entities was instituted. The purpose of this study is to assess the technical and economic feasibility of using epoxy coatings as an alternative to polyethylene insulation of pipelines. Laboratory studies of samples of three epoxy coating systems, as well as a comparative analysis of the process properties of epoxy and polyethylene insulation were conducted. It has been established that epoxy coatings are superior to polyethylene coatings in a number of properties, in particular, they are characterized by increased resistance to temperature effects, UV radiation, cathodic disbondment, as well as increased mechanical strength, which makes it possible to ensure safety of the coating during the construction of pipelines by directional drilling and laying in rocky soils. The main production facilities for raw materials for epoxy powder coatings are localized in Russia, while raw materials for polyethylene coatings are mainly produced abroad. The economic feasibility of using a twolayer epoxy coating as an alternative to a three-layer polyethylene coating for pipelines of large diameters (over 720 mm (28 in)) was established. Testing for the introduction of pipes with a two-layer epoxy coating at the Transneft PJSC facilities is being performed, including construction of an experimental pipeline section.


2017 ◽  
Vol 164 (2) ◽  
pp. C54-C60 ◽  
Author(s):  
Bei Qian ◽  
Zuwei Song ◽  
Long Hao ◽  
Wei Wang ◽  
Debing Kong

RSC Advances ◽  
2015 ◽  
Vol 5 (36) ◽  
pp. 28769-28777 ◽  
Author(s):  
S. A. Haddadi ◽  
M. Mahdavian ◽  
E. Karimi

In this study, corrosion protection of epoxy coating containing surface modified nano-zirconia was evaluated and compared to that containing unmodified nano-zirconia.


2021 ◽  
Vol 1035 ◽  
pp. 554-561
Author(s):  
Li Juan Zhu ◽  
Chun Feng ◽  
Ya Chong Song ◽  
Ya Qiong Cao ◽  
Li Hong Han ◽  
...  

Epoxy coatings and Reduced Graphene Oxide (RGO) modified epoxy coatings were prepared on N80 tubing steel. The influence of temperature on the corrosion resistance of RGO modified epoxy coatings was studied. And the corrosion behavior of epoxy coatings and RGO modified epoxy coatings in 10.0 wt% NaCl solution at different temperatures was compared. The results showed that the corrosion resistance of both coatings decreased with the increase of temperature. However, the corrosion resistance of RGO modified epoxy coating was two to three orders of magnitude higher than that of epoxy coating at different test temperature. The addition of RGO nanosheets greatly enhanced the corrosion resistance of epoxy composite coatings in 10.0 wt% NaCl solution at high temperature due to their high impermeability and negative coefficient of thermal expansion.


2017 ◽  
Vol 229 ◽  
pp. 39-46 ◽  
Author(s):  
Shihui Qiu ◽  
Cheng Chen ◽  
Wenru Zheng ◽  
Wei Li ◽  
Haichao Zhao ◽  
...  

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