Corrosion Behavior of Carbon Steels Q235 and Q450 in Dry Hot Atmosphere at Turpan District for Four Years

doi:10.11902/1005.4537.2017.153

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (5): 431-437 DOI: 10.11902/1005.4537.2017.153

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Corrosion Behavior of Carbon Steels Q235 and Q450 in Dry Hot Atmosphere at Turpan District for Four Years

Li WANG¹, Chunyun GUO², Kui XIAO¹, Tuerxun·Silayiding², Chaofang DONG¹, Xiaogang LI¹

1 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2 Xinjiang Turpan Natural Environmental Test Research Center, Turpan 838200, China

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Abstract

Atmospheric exposure of carbon steels Q235 and Q450 were conducted for 4 a in dry hot atmospheric environment at Turpan district of Xinjiang Uygur Autonomous Region. The results showed that the surface of the two steels presented obvious corrosion products scale. The average corrosion rate of Q450 and Q235 was 12 and 14 g·m^-2·a^-1 respectively. Thus, Q450 steel exhibits corrosion rate lower than Q235 steel, and while the corresponding corrosion pits were relatively shallow. The corrosion products of the two steels composed mainly of α-FeOOH, γ-FeOOH and Fe₂O₃·H₂O, while the proportion of α-FeOOH for Q450 was higher than that for Q235. The corrosion products on Q450 were relatively dense. Thereby, it hindered the absorption of water and sediment, leading to the decrease of corrosion rate. The result of EIS demonstrated that the resistance of corrosion products and surface charge transfer of Q450 was greater than that of Q235, i.e. the corrosion products of Q450 had better protectiveness.

Key words: carbon steel Turpan atmospheric corrosion

Received: 20 September 2017

ZTFLH:

TG172

Fund: Supported by National Key Research and Development Program of China (2017YFB0702300), National NaturalScience Foundation of China (51671029) and Fundamental Research Funds for the Central Unive-rsities (FRF-TP-17-002B)

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	Li WANG
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	Tuerxun·Silayiding
	Chaofang DONG
	Xiaogang LI

Cite this article:

Li WANG, Chunyun GUO, Kui XIAO, Tuerxun·Silayiding, Chaofang DONG, Xiaogang LI. Corrosion Behavior of Carbon Steels Q235 and Q450 in Dry Hot Atmosphere at Turpan District for Four Years. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 431-437.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.153 OR https://www.jcscp.org/EN/Y2018/V38/I5/431

Table 1 Chemical compositions of Q235 and Q450 steels(mass fraction / %)

Table 2 Average weather date of Turpan atmospheric exposure station in the period of 2012.07~2013.07^[5]

Fig.1 Maco morphologies of Q235 (a) and Q450 (b) steels after exposure in atmospheric enviroment in Turpan area for 4 a

Fig.2 Surface morphologies of Q235 (a) and Q450 (b) steels after exposure in atmospheric enviroment in Turpan area for 4 a

Fig.3 Corrosion rates of Q235 and Q450 steels exposed in Turpan area for different time

Fig.4 Corrosion pit depth distributions of Q235 (a) and Q450 (b) steels after exposure in atmospheric enviroment in Turpan area for 4 a

Fig.5 Corrosion pit depths of Q235 and Q450 steels after exposure in atmospheric enviroment in Turpan area for 4 a

Fig.6 Section morphology and EDS result of the corrosion products of Q235 steel after exposure in atmospheric enviroment in Turpan area for 4 a

Fig.7 Section morphology and EDS result of the corrosion products of Q450 steel after exposure in atmospheric enviroment in Turpan area for 4 a

Fig.8 XRD patterns of the corrosion products formed on Q235 and Q450 steels after exposure for 4 a in Turpan atmospheric environment

Fig.9 EIS result of Q235 and Q450 steels after exposure in atmospheric enviroment in Turpan area for 4 a

Fig.10 Electrochemical equivalent circuit of EIS

Table 3 Fitting values of various parameters based on EIS

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