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Naphthenic acid corrosion characteristic and corrosion product film resistance of carbon steel and Cr5Mo low alloy steel in secondary vacuum gas oil
School of Materials Science & Engineering, Beifang University of Nationalities, Yinchuan, Ningxia.
School of Materials Science & Engineering, Beifang University of Nationalities, Yinchuan, Ningxia.
SINOPEC Research Institute of Safety Engineering.
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences.
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Rekke forfattare: 82016 (engelsk)Inngår i: Corrosion Engineering, Science and Technology, ISSN 1478-422X, E-ISSN 1743-2782, Vol. 51, nr 6, s. 445-454Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Although naphthenic acid corrosion (NAC) has been studied for many years, the mechanism of NAC is not fully understood. The objective of this paper is to study high-temperature NAC in secondary vacuum gas oil of an industrial crude oil vacuum distillation tower. A high-temperature autoclave was applied to conduct high-temperature corrosion test to investigate NAC behaviour of carbon steel and Cr5Mo low alloy steel at different sulphur contents and total acid numbers (TAN). The result shows that the corrosion rate of carbon steel and low alloy steel is high at low TAN and high TAN while it keeps at a low value at medium TAN. Corrosion product film on Cr5Mo low alloy steel surface is denser and more compact than that of carbon steel at high TAN. The chromium present in Cr5Mo low alloy steel plays an important role in NAC resistance by the formation of Cr7S8 film in the inner layer of the scale. Corrosion rates of the two steels in secondary vacuum gas oil are high at low TAN and high TAN, but low at medium TAN which are strange and different from previous experimental results conducted in non-industrial oil solution. A tentative explanation for this new phenomenon is also put forward.

sted, utgiver, år, opplag, sider
2016. Vol. 51, nr 6, s. 445-454
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Forskningsprogram
Processmetallurgi
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URN: urn:nbn:se:ltu:diva-14796DOI: 10.1080/1478422X.2015.1137431ISI: 000382963300007Scopus ID: 2-s2.0-84978536283Lokal ID: e37892da-fd39-46c0-a883-bd5f7a3fbe63OAI: oai:DiVA.org:ltu-14796DiVA, id: diva2:987769
Merknad

Validerad; 2016; Nivå 2; 2016-10-12 (andbra)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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