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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (4): 305-310    DOI: 10.11902/1005.4537.2014.122
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Corrosion and Corrosion Inhibition of 304 Stainless Steel in Acidic FeCl3 Solution with Applied Inhibitor K2Cr2O7 and Ultrasonic Vibration
Yurong FANG,Chaoyang FU()
Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract  

The corrosion and corrosion inhibition of type 304 stainless steel (304SS) were studied by weight loss method and electrochemical methods in 6%FeCl3 solution of pH=1 with or without inhibitor K2Cr2O7 under quiescent and ultrasonic vibration. Then the surface morphology of the corroded steel was observed by scanning electron microscope (SEM). The results indicate that the general corrosion and pitting corrosion of 304SS can be suppressed by the application of ultrasound. The corrosion of 304SS is accelerated when concentration of K2Cr2O7 is lower in the quiescence FeCl3 solution, but different concentration of K2Cr2O7 exhibits a good corrosion inhibition effect under ultrasonic vibration in the same FeCl3 solution. The combination of ultrasound and inhibitor K2Cr2O7 make the break potential for pitting corrosion and charge transfer resistance of 304SS increased greatly. Therefore, a good synergistic inhibition effect occurs between ultrasonic vibration and inhibitor K2Cr2O7 for 304SS in the acidic medium.
Key words:  type 304 stainless steel      FeCl3 solution      pitting corrosion      corrosion inhibitor      ultrasonic effect     
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Yurong FANG
Chaoyang FU

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Yurong FANG,Chaoyang FU. Corrosion and Corrosion Inhibition of 304 Stainless Steel in Acidic FeCl3 Solution with Applied Inhibitor K2Cr2O7 and Ultrasonic Vibration. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 305-310.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.122     OR     https://www.jcscp.org/EN/Y2015/V35/I4/305

Quiescence condition Corrosion rate / gm-2h-1 Inhibition efficiency Ultrasonic condition Corrosion rate gm-2h-1 Inhibition efficiency
Inhibitor free 18.28 --- Inhibitor free 8.493 ---
20 mg/L K2Cr2O7 19.11 -4.5% 20 mg/L K2Cr2O7 4.395 48.3%
50 mg/L K2Cr2O7 21.54 -17.8% 50 mg/L K2Cr2O7 0.313 96.3%
100 mg/L K2Cr2O7 22.64 -23.9% 100 mg/L K2Cr2O7 0.282 96.7%
200 mg/L K2Cr2O7 23.20 -26.9% 200 mg/L K2Cr2O7 0.172 98.0%
500 mg/L K2Cr2O7 19.04 -4.2% 500 mg/L K2Cr2O7 0.143 98.3%
1000 mg/L K2Cr2O7 15.37 15.9% 1000 mg/L K2Cr2O7 0.135 98.4%
2000 mg/L K2Cr2O7 9.10 50.2% 2000 mg/L K2Cr2O7 0.123 98.6%
5000 mg/L K2Cr2O7 0.457 97.5% 5000 mg/L K2Cr2O7 0.065 99.2%
Table 1  Mass losses of 304SS after immersion tests under different conditions
Fig.1  Corrosion appearances of 304SS after immersion for 6 h in 6.0%FeCl3 solution (pH=1) without (a, c) and with (b, d) 2000 mg/L K2Cr2O7 in quiescence (a, b) and ultrasound (c, d), respectively
Fig.2  Anodic curves of 304SS in different conditions
Fig.3  Nyquist (a), impedance module (b) and phase angle (c) plots of 304SS under different conditions
Fig.4  Equivalent circuit
Experimental condition Rs / Ωcm2 CPE-T / Fcm-2 CPE-P Rct / Ωcm2
Quiescence/blank 4.902 3.34×10-4 0.765 46.2
Quiescence/2000 mg/L K2Cr2O7 0.808 4.59×10-4 0.813 149.8
Ultrasound/blank 1.750 1.22×10-4 0.855 167.4
Ultrasound/2000 mg/L K2Cr2O7 1.388 2.54×10-4 0.687 1156
Table 2  Values of equivalent circuit elements of 304SS
Fig.5  FE-SEM surface morphologies of 304SS under different experimental conditions: (a) quiescence/blank, (b) ultrasound/blank, (c) quiescence/2000 mg/L K2Cr2O7, (d) ultrasound/2000 mg/L K2Cr2O7
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