INHIBITION OF N,N-DIETHYLAMMONIUM O,O'-DICYCLOHEXYLDITHIOPHOSPHATE FOR Q235 STEEL IN SULFURIC SOLUTION

J Chin Soc Corr Pro

2011, Vol. 31

Issue (3): 225-230 DOI:

Research Articles

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INHIBITION OF N,N-DIETHYLAMMONIUM O,O'-DICYCLOHEXYLDITHIOPHOSPHATE FOR Q235 STEEL IN SULFURIC SOLUTION

XIE Bin^1,2, LAI Chuan³, ZOU Like², HE Linxin², WU Yizheng², HUANG Yanjun³, XIANG Yangguang³

1. University Key Laboratory of Material Corrosion and Protection of Sichuan Province, Zigong 643000
2. Institute of Functionalized Materials, Sichuan University of Science & Engineering, Zigong 643000
3. School of Material and Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000

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Abstract A new corrosion inhibitor N,N-diethylammonium O,O' -dicyclohexyldithiophosphate (EDCDP) has been synthesized. The inhibition effect of EDCDP against the corrosion of Q235 steel in H₂SO₄ solution was studied by mass loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. mass loss shows that the inhibition efficiency is up to 97.32 % at the inhibitor concentration of 100 mg/L in 5 % H₂SO₄solution. The adsorption of EDCDP on Q235 steel surface obeys the Langmuir's isotherm. Polarization curves indicate that the EDCDP is a mixed type inhibitor. The inhibition efficiency of EDCDP is less impact by concentration of H₂SO₄, temperature and immersion time.

Key words: O,O'-dialkyldithiophosphate H₂SO₄ corrosion inhibitor Q235 steel adsorption inhibition efficiency

Received: 29 March 2010

ZTFLH:

TG174.42

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XIE Bin, LAI Chuan, ZOU Like, HE Linxin, WU Yizheng, HUANG Yanjun, XIANG Yangguang. INHIBITION OF N,N-DIETHYLAMMONIUM O,O'-DICYCLOHEXYLDITHIOPHOSPHATE FOR Q235 STEEL IN SULFURIC SOLUTION. J Chin Soc Corr Pro, 2011, 31(3): 225-230.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2011/V31/I3/225

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