Electrochemical Corrosion Behavior of FeMnSi/B10 Couple Pair in 3.5%NaCl Solution at Different Temperatures

• Published in: Cai liao bao hu Vol. 56; no. 9; pp. 75 - 82
• Main Author: CHONG Jiantao, ZHAO Jie, LIN Chengxin, YU Yuequn
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Materials Protection 01.09.2023
• Subjects: femnsi memory alloy|b10 copper-nickel alloy|galvanic corrosion|temperature|corrosion behavior
• ISSN: 1001-1560
• DOI: 10.16577/j.issn.1001-1560.2023.0215

The connection between B10 seawater pipeline and FeMnSi memory alloy pipe joint is prone to galvanic corrosion.In order to clarify the galvanic corrosion mechanism of FeMnSi/B10， the corrosion behavior， corrosion morphology， and corrosion product components of FeMnSi/B10 couple pair in 3.5% (mass fraction) NaCl solution at different temperatures were analyzed by electrochemical test， corrosion weight loss method， SEM， and EDS.Results showed that when galvanic corrosion occurred in FeMnSi/B10， FeMnSi was the cathode and B10 was the anode.The corrosion thermodynamic trends and corrosion rates of FeMnSi and B10 both increased with the increase of temperature.Moreover， the galvanic current density of FeMnSi/B10 couple pair dropped sharply at the beginning， slowed down with time， and finally reached a stable value.When the temperature increased from 25 ℃to 45 ℃， the galvanic current density of the couple pair increased by about 1 time，indicating that the corrosion resistance of the FeMnSi/B10 couple pair was more