Comparative Analysis of Corrosion-Resistant Alloys Inconel 718 and ÉP718

Khar’kov, A. A.; Shakhmatov, Aleksey; Gyulikhandanov, E. L.; Alekseeva, Ekaterina

doi:10.1007/s10556-019-00546-4

Cited by 14 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nickel-base alloys are widely used in the oil and gas recovery industry due to a good combination of strength and corrosion properties. Earlier studies [1] have shown that the corrosion properties in immersion test and electrochemical tests for Ni-based EP718 alloy are slightly lower than that for alloy 718. At the same time, it has been found that various non-metallic inclusions observed on polished metal samples of EP718 alloys can significantly reduce its corrosion resistance.…”

Section: Introductionmentioning

confidence: 79%

“…Moreover, the Type 1B sulphides (TiNb-S,C) are present mostly as thin plates with a thickness of 1-2 μm. However, these inclusions were recognized in a previous article [1] as "needles", based on 2-D investigations on polished surfaces of the metal samples. The Type 1D inclusions include small size (0.5-4.2 µm) carbides, which contain Nb, Ti, Mo, W, Cr, Fe and Ni.…”

Section: Evaluation Of the Non-metallic Inclusionsmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of non-metallic inclusions in corrosion -resistance nickel - based EP718 and 718 alloys by using electrolytic extraction method

et al. 2019

View full text Add to dashboard Cite

It is known that non-metallic inclusions (NMI) that are formed during steel production and heat treatment can significantly affect the properties of final steel products. Therefore, it is very important to be able to determine the content of harmful NMI in steels. Nickel-based alloys are widely used in the oil and gas recovery industry, due to a good combination of strength and corrosion properties. Earlier studies have shown that the corrosion properties in immersion test and electrochemical tests for Ni-based EP718 alloys are slightly lower than that for 718 alloys. The focus in this study was the influence of different NMI on the corrosion resistance of these alloys. The characteristics of inclusions (such as size, morphology, and chemical composition) were analysed by using the electrolytic extraction method followed by three-dimensional investigations using SEM in combination with EDS. It was found that some non-metallic inclusions in EP718 alloys significantly reduce its corrosion resistance. It was also shown that a primary dissolution of the metal matrix occurs around certain inclusions during electrolytic extraction. Based on obtained results, the corrosion active non-metallic inclusions can be determined in these Nickel-base alloys and some recommendations for optimization of their production technology can be formulated.

show abstract

Section: Introductionmentioning

confidence: 79%

Section: Evaluation Of the Non-metallic Inclusionsmentioning

confidence: 99%

Characterization of non-metallic inclusions in corrosion -resistance nickel - based EP718 and 718 alloys by using electrolytic extraction method

et al. 2019

View full text Add to dashboard Cite

show abstract

“…For example, when developing a new paint system, a 1000-hour test will significantly lengthen the development cycle. Autoclave test is one of the options for accelerating research, it combined effect of temperature, pressure and an aggressive environment Autoclave testing is used to assess the resistance of both metals and coatings [5,6]. There are standards and recommendations for conducting such tests, but as a rule, such documents describe general steps for conducting [7,8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of factors influencing on the autoclave tests results of internal anticorrosive polymer coatings

Kovalev

Alekseeva

Shaposhnikov

et al. 2021

Proceedings of the 1st International Electronic Conference on Metallurgy and Metals

View full text Add to dashboard Cite

The use of polymer coatings is one of the most common methods of 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. One of the open questions is predicting the life of the selected protective coating. Existing research methods are aimed at assessing the quality of coating application and its behavior under conditions that simulate operational ones, but they do not allow to talk about a guaranteed service life. In this regard, laboratory tests should include tests as close as possible to operational influences in order to identify the deficiencies of the investigated coatings. The paper discusses the methodological features of autoclave testing with a pressure drop for polymer powder coatings. Autoclave tests simulate operating conditions, but the way they are performed can affect the final result. Autoclave decompression tests were carried out in environments containing CO2 and H2S gases. The effects of pressure release rate, temperature and coating quality were evaluated. Methods for assessing the degradation of coatings after testing are considered. The result of the work is a description of the factors that can affect the results of autoclave decompression tests of polymer anticorrosive coatings.

show abstract

“…An autoclave test is the option for accelerating research: it combines the effect of temperature, pressure, and an aggressive environment. Autoclave testing is used to assess the resistance of both metals and coatings [5,6]. There are standards and recommendations for conducting such tests, but such documents describe general steps for conducting [7,8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Factors Influencing the Autoclave Tests Results of Internal Anticorrosive Polymer Coatings

Kovalev

Alekseeva

Shaposhnikov

et al. 2021

Metals

View full text Add to dashboard Cite

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.

show abstract

Comparative Analysis of Corrosion-Resistant Alloys Inconel 718 and ÉP718

Cited by 14 publications

References 4 publications

Characterization of non-metallic inclusions in corrosion -resistance nickel - based EP718 and 718 alloys by using electrolytic extraction method

Characterization of non-metallic inclusions in corrosion -resistance nickel - based EP718 and 718 alloys by using electrolytic extraction method

Investigation of factors influencing on the autoclave tests results of internal anticorrosive polymer coatings

Investigation of Factors Influencing the Autoclave Tests Results of Internal Anticorrosive Polymer Coatings

Contact Info

Product

Resources

About