High temperature naphthenic acid corrosion and sulphidic corrosion of Q235 and 5Cr1/2Mo steels in synthetic refining media

Qu, Dingrong; Zheng, Yuan; Jing, H. M.; Yao, Zhimin; Ke, Wei

doi:10.1016/j.corsci.2005.08.016

Cited by 67 publications

(39 citation statements)

References 20 publications

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“…6). M. J. Nugent et al also believed that chromium provides good resistance to SC, 9 while D. R. Qu et al considered that element chromium plays an important role in combating naphthenic corrosion, 16,21 which are in accordance with the present work.…”

Section: Effect Of Corrosion Scales On Corrosion Behavioursupporting

confidence: 91%

Naphthenic acid corrosion characteristic and corrosion product film resistance of carbon steel and Cr5Mo low alloy steel in secondary vacuum gas oil

Liu

Zhang

et al. 2016

Corrosion Engineering, Science and Technology

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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 hightemperature 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 Cr 7 S 8 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.

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Section: Effect Of Corrosion Scales On Corrosion Behavioursupporting

confidence: 91%

Naphthenic acid corrosion characteristic and corrosion product film resistance of carbon steel and Cr5Mo low alloy steel in secondary vacuum gas oil

Liu

Zhang

et al. 2016

Corrosion Engineering, Science and Technology

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show abstract

“…The thermal stability of the oxide layer is influenced by the composition and thickness of the oxide layer as well as the bond to the underlying metal [6]. Determining factors for the high temperature corrosion are generally: metallurgy, TAN (chloridric and naphthenic acid), local flow conditions, sulphur compounds [12]. Sulphur compounds, originated from crude oils, include poly-sulphides, mercaptans, aliphatic sulphides, disulphides and thiophenes.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the causes of failure in 5Cr-1Mo pipes mounted in a preheating furnace

Borruto

Narducci

Pietrosanti³

2012

Frattura Ed Integrità Strutturale

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The oxidation resistance of iron-based alloys depends on the formation of thin protective films consisting of reaction products between the alloys and the ambient atmosphere. The high corrosion resistance of Fe-Cr-Mo alloys has been attributed to the rapid formation of a uniform, highly protective passive film. The pipes hardness and resistance to various forms of corrosion are determined by the composition of the oxide layer that plays an important role in determining the lifetime of the pipes themselves. The thermal stability of the oxide layer is influenced by its composition and thickness as well as by the bond to the underlying metal. Determining factors for the high temperature corrosion are generally: temperature, metallurgy, TAN (chloridric and naphthenic acid), local flow conditions, sulphur compounds.

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“…9 Qu and co-workers showed the effectiveness of the combined presence of Mo and Cr toward NA corrosion. 10 Studies have also been conducted on the resistance of nickel-based alloys in highly corrosive acetic acid media. 11 To the best of the authors' knowledge, little effort has been devoted to studying the behavior of the alloying elements individually, even though such studies might improve the understanding of each element's contribution in curbing NA corrosion of ferrous alloys.…”

Section: Introductionmentioning

confidence: 99%

An Acoustic Microbalance Study of High-Temperature Naphthenic Acid Corrosion of Common Iron-Alloying Elements

Patrick¹,

Chakravarti²,

Devine

2015

CORROSION

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The naphthenic acid corrosion of iron and of several alloying elements used in many commercial ferrous alloys was investigated in oil-based solutions at a temperature of 270°C. Dynamic corrosion rates were measured over time periods of several hours with an ultrasensitive, acoustic gallium orthophosphate crystal microbalance. The results provide insight into the corrosion behavior of various iron alloys in a refinery environment and can be used to understand the origin of the corrosion resistance of these alloys.

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High temperature naphthenic acid corrosion and sulphidic corrosion of Q235 and 5Cr1/2Mo steels in synthetic refining media

Cited by 67 publications

References 20 publications

Naphthenic acid corrosion characteristic and corrosion product film resistance of carbon steel and Cr5Mo low alloy steel in secondary vacuum gas oil

Naphthenic acid corrosion characteristic and corrosion product film resistance of carbon steel and Cr5Mo low alloy steel in secondary vacuum gas oil

Analysis of the causes of failure in 5Cr-1Mo pipes mounted in a preheating furnace

An Acoustic Microbalance Study of High-Temperature Naphthenic Acid Corrosion of Common Iron-Alloying Elements

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