Effect of Hydrostatic Pressure on Corrosion Behavior of 10CrNi3MoV Steel

doi:10.11902/1005.4537.2016.135

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 183-188 DOI: 10.11902/1005.4537.2016.135

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Effect of Hydrostatic Pressure on Corrosion Behavior of 10CrNi3MoV Steel

Fu DONG,Yulong HU(

),Xin ZHAO,Zhiqiao WANG

College of Science, Naval University of Engineering, Wuhan 430033, China

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Abstract

The effect of hydrostatic pressure and its alternative variation on the corrosion behavior of 10CrNi3MoV steel in 3.5%(mass fraction)NaCl solution was studied by means of high-pressure static immersion test, potential measurement and electrochemical impedance spectra (EIS). The results show that the dissolved oxygen of solution and the ratio of Fe₂O₃ in the corrosion products all decrease with the enhancement of hydrostatic pressure, which result in the decline of corrosion potential and the decrease of corrosion rate. Alternative hydrostatic pressures led to the changes of the interaction between corrosion products and the steel, and the rust structures, which then enhanced the corrosion rate as a result, the corrosion rate increased with the increasing hydrostatic pressure. Under the specific conditions in this paper, the corrosion rate of 10CrNi3MoV steel in 3.5%NaCl solution under alternative hydrostatic pressures between atmospheric pressure and 4 MPa is 3.5 times of that under atmospheric pressure.

Key words: hydrostatic pressure alternation of pressure corrosion product electrochemical impedance spectra

Received: 31 August 2016

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Cite this article:

Fu DONG,Yulong HU,Xin ZHAO,Zhiqiao WANG. Effect of Hydrostatic Pressure on Corrosion Behavior of 10CrNi3MoV Steel. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 183-188.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.135 OR https://www.jcscp.org/EN/Y2017/V37/I2/183

Fig.1 Schematic diagram of high-pressure test equipment

Fig.2 Time schematic diagram of changes of pressures

Fig.3 Changes of corrosion potential under atmospheric pressure (AP), 2 MPa, 4 MPa hydrostatic pressures (a) and alternation of hydrostatic pressure between 2 MPa-AP and 4 MPa-AP (b)

Fig.4 Nyquist diagrams of 10CrNi3MoV steel after immersion in 3.5%NaCl solution under different pressures for different time

Table 1 Simulated results of R_p under different pressures

Fig.5 Nyquist diagrams of 10CrNi3MoV steel after immersion in 3.5%NaCl solution under alternation of hydrostatic pressures between 2 MPa-AP (a) and 4 MPa-AP (b) for different time

Table 2 Simulated R_p results of EIS under alternation of hydrostatic pressures

Table 3 Corrosion rates of 10CrNi3MoV steel under different hydrostatic pressures and alternation of hydrostatic pressures

Fig.6 Surface images of 10CrNi3MoV steel after immersion tests under different hydrostatic pressures: (a) AP; (b) 2 MPa; (c) 4 MPa; (d) alternation of pressure between 2 MPa-AP; (e) alternation of pressure between 4 MPa-AP

Fig.7 XRD spectra of corrosion products of 10CrNi3MoV steel after immersion tests under different hydrostaticpressures (a) and alternation of hydrostatic pressures (b)

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