Corrosion Properties of B30 Cu-Ni Alloy and 316L Stainless Steel in a Heat Pump System

doi:10.11902/1005.4537.2013.221

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (6): 544-549 DOI: 10.11902/1005.4537.2013.221

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Corrosion Properties of B30 Cu-Ni Alloy and 316L Stainless Steel in a Heat Pump System

CHANG Qinpeng¹, CHEN Youyuan^1,²(

), SONG Fang¹, PENG Tao³

1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
2. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
3. China Institute of Geotechnical Investigation and Surveying Co. Ltd, Beijing 100007, China

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Abstract

The electrochemical corrosion behavior of 316L stainless steel and B30 Cu-Ni alloy in saline groundwater with variation of electric conductivity, pH value and flow velocity was investigated by potentiodynamic polarization curves and EIS. The results showed that the corrosion current density and pitting sensitivity of B30 Cu-Ni alloy increased rapidly with the increase of the conductivity, while that of 316L stainless steel increased slowly. The corrosion resistance of 316L stainless steel was better than that of B30 Cu-Ni alloy. In acidic solution, B30 Cu-Ni alloy exhibited characteristic of uniform corrosion without appearance of pitting corrosion. With the increasing of pH value, pitting corrosion of B30 Cu-Ni alloy was promoted while that of 316L stainless steel was inhibited. As the flow velocity increased up to 1 m/s, the stability of the passive film of B30 Cu-Ni alloy was damaged, while that of 316L stainless steel was not affected. These results provide a reference to the choice of the metal materials for heat pump system.

Key words: B30 Cu-Ni alloy 316L stainless steel conductivity pH value corrosion

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TG172.5

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Cite this article:

CHANG Qinpeng, CHEN Youyuan, SONG Fang, PENG Tao. Corrosion Properties of B30 Cu-Ni Alloy and 316L Stainless Steel in a Heat Pump System. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 544-549.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.221 OR https://www.jcscp.org/EN/Y2014/V34/I6/544

Table 1 Chemical components of B30 Cu-Ni alloy and 316L stainless steel

Fig.1 Polarization curves of B30 Cu-Ni alloy (a) and 316L stainless steel (b) in saline groundwater with different electric conductivities

Table 2 Fitted parameters of B30 Cu-Ni alloy and 316L stainless steel in saline groundwater with different electric conductivities

Fig.2 Nyquist plots for B30 Cu-Ni alloy (a) and 316L stainless steel (b) in saline groundwater with different electric conductivities

Fig.3 Equivalent circuits of B30 Cu-Ni alloy (a) and 316L stainless steel (b)

Fig.4 Polarization curves of B30 Cu-Ni alloy (a) and 316LSS (b) in saline groundwater at different pH values

Table 3 Fitted parameters of B30 Cu-Ni alloy and 316L stainless steel in saline groundwater at different pH values

Fig.5 Polarization curves of B30 Cu-Ni alloy and 316L stainless steel at static state and 1 m/s flow velocity

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