Stability and Erosion Corrosion Behavior of Corrosion Product Film of Q235 Carbon Steel and Cr5Mo Low Alloy Steel in Simulated Oil Refinery Media

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (2): 122-128 DOI:

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Stability and Erosion Corrosion Behavior of Corrosion Product Film of Q235 Carbon Steel and Cr5Mo Low Alloy Steel in Simulated Oil Refinery Media

LIU Guiqun¹, ZHENG Yugui¹(

), JIANG Shengli¹, JING Junhang², DONG Weijuan², ZENG Hong², SI Pinxian²

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Jinxi Petrochemical Company, Petro China, Huludao 125001, China

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Abstract

Increasing demand on the oil market has raised interest in oils with high naphthenic acid content. These oils were previously considered of lower quality due to their corrosive characteristic. Although naphthenic acids corrosion (NAC) has been studied for many years, the mechanism of NAC is not fully understood yet. In this work, the stability of corrosion product films formed on Q235 carbon steel and Cr5Mo low alloy steel in second vacuum side distillates were studied with a high temperature static immersion apparatus. While the erosion corrosion behavior of the corrosion product films in simulated oil refinery media with various total acid number (TAN) and sulfur content was investigated by means of a high temperature and high flow rate NAC simulation device. The results showed that the formation and dissolution of the corrosion product films are on dynamic equilibrium state. The corrosion product films could be easily dissolved in the sulfide-free and naphthenic acid-containing refined oil. Under flowing conditions, corrosion resistance of Q235 carbon steel is much lower than that of Cr5Mo steel, and their difference becomes more obvious with the increase of TAN. The element Cr in Cr5Mo alloy plays a very important role to form the corrosion product film of chromium sulfide, which exhibits much better protectiveness rather than the film formed on Q235 carbon steel.

Key words: naphthenic acid corrosion (NAC) second vacuum side distillate sulphide film erosion corrosion

Received: 24 April 2014

ZTFLH:

TG174.4

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	Guiqun LIU
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Cite this article:

LIU Guiqun, ZHENG Yugui, JIANG Shengli, JING Junhang, DONG Weijuan, ZENG Hong, SI Pinxian. Stability and Erosion Corrosion Behavior of Corrosion Product Film of Q235 Carbon Steel and Cr5Mo Low Alloy Steel in Simulated Oil Refinery Media. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 122-128.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2015/V35/I2/122

Table 1 Chemical compositions of Q235 steel and Cr5Mo steel

Table 2 Properties of the experiment media

Fig.1 Schematic diagram of corrosion immersing apparatus

Fig.2 Schematic diagram of specimen testing chamber

Fig.3 Surface morphologies of specimen before immersion test in sulfur-free, naphthenic acid-contaning refined oil: (a) general view, (b) local view of Q235 steel, (c) local view of Cr5Mo steel

Fig.4 Cross section images of corrosion product films of Q235 (a) and Cr5Mo (b) steels

Fig.5 Cross-sectional EDS mapping analysis of corrosion product film of Cr5Mo steel: (a) SEM image, (b) Fe drstribution, (c) S distribution, (d) Cr distribution

Fig.6 Schematic diagrams of the growing mechanism of the scales on Q235 (a) and Cr5Mo (b) steels

Fig.7 Curves of specimen mass vs immersion time at TAN=3.3

Fig.8 Surface morphologies of Q235 (a, c, e) and Cr5Mo (b, d ,f) specimens after immersion in sulfur-free, naphthenic acid-containing refined oil for 2 h (a, b), 4 h (c, d) and 6 h (e, f)

Fig.9 Corrosion rates of Q235 carbon steel (a) and Cr5Mo low allow steel (b)

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