Corrosion Behavior of Incoloy825 Alloy in 3.5%NaCl Solution at Different Temperatures

doi:10.11902/1005.4537.2016.089

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (6): 631-636 DOI: 10.11902/1005.4537.2016.089

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Corrosion Behavior of Incoloy825 Alloy in 3.5%NaCl Solution at Different Temperatures

Min ZHU¹(

),Yongfeng YUAN¹,Jun LIU²,Lun NIE³,Jian ZHOU¹

1. School of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China
2. Ninth Oil Production Plant, Daqing Oil Field Co., Ltd, Daqing 163853, China
3. Zhejiang Meili High Technology Co., Ltd, Xinchang 312500, China

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Abstract

The corrosion behavior of Incoloy825 alloy in 3.5%NaCl solution was studied in a temperature range 30~60 ℃ by polarization curve measurement, electrochemical impedance spectroscopy (EIS) and immersion test. The results show that the corrosion degree of Incoloy825 alloy increases with the increase of solution temperature, meanwhile, the size and density of corrosion pits increase. Moreover, the corrosion form is changed from general corrosion to localized pitting corrosion. The corrosion rate of the alloy increases with the increased temperature, which may be due to the synthetically effect of the two opposite factors i.e. the block effect with reducing oxygen and the stimulation effect with enhancing ion activity on the electrode process. Whilst the activity of chloride ion may play an important role in the acceleration of the corrosion process.

Key words: Incoloy825 alloy temperature NaCl solution corrosion behavior

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	Min ZHU
	Yongfeng YUAN
	Jun LIU
	Lun NIE
	Jian ZHOU

Cite this article:

Min ZHU,Yongfeng YUAN,Jun LIU,Lun NIE,Jian ZHOU. Corrosion Behavior of Incoloy825 Alloy in 3.5%NaCl Solution at Different Temperatures. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 631-636.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.089 OR https://www.jcscp.org/EN/Y2016/V36/I6/631

Fig.1 Metallograph of Incoloy825 alloy

Fig.2 Corrosion rates of Incoloy825 alloy in 3.5%NaClsolution at different temperatures

Fig.3 Corrosion morphologies of Incoloy825 alloy after immersion in 3.5%NaCl solution at 30 ℃ (a),40 ℃ (b), 50 ℃ (c) and 60 ℃ (d) for 30 d

Fig.4 Surface morphologies of Incoloy825 alloy at 30 ℃ (a), 40 ℃ (b), 50 ℃ (c) and 60 ℃ (d) for 30 dafter removal of the corrosion product

Table 1 Chemical composition of black granular corrosion products

Fig.5 Polarization curves of Incoloy825 alloy under different solution temperature

Table 2 Corrosion potential and corrosion current density of Incoloy825 alloy at different temperatures in 3.5%NaCl solution

Fig.6 Nyquist plot (a), Bode plot of phase angle (b) and Bode plot of |Z | (c) of incoloy 825 alloy under different solution temperatures

Fig.7 Corresponding equivalent circuit

Fig.8 Curve of charge transfer resistance R_t as temperatureincreased

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