INHIBITIVE EFFECT OF AROMATIC PHOSPHONIUM SALTS ON CORROSION OF ALUMINIUM IN ALUMINIUM PERCHLORATE SOLUTION

J Chin Soc Corr Pro

1996, Vol. 16

Issue (3): 235-240 DOI:

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INHIBITIVE EFFECT OF AROMATIC PHOSPHONIUM SALTS ON CORROSION OF ALUMINIUM IN ALUMINIUM PERCHLORATE SOLUTION

HE Zuoqing; LI Jinliang (department of Chemistry; Xuzhou Teachers College)

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Abstract The inhibitive effect of (P-NO2C6H4)N(C6H5)3Br(NPTPHB) and (p-NO2C6H4)P(C6H5)3Br(NPTPPB (CH5-C6H4) P(C6H5)aBr(MPTPPB) and [CH3(CH2)3CH2-C6H4]P(C6H5)3 Br(PPTPPB) on corrosion of aluminium in 1 mol/L Al(ClO4)3 solution at 15～35℃ and the effect of molecular structure of phosphonium salts on inhibitive efficiency were studied by using the differential polarization resistance and electrochemical impedance techniques. The results showed that all the three phosphonium salts inhibited the corrosion of aluminium. The inhibitive effect of the phosphonium salt was greater than that of the quaternary ammonium salt with similar structure. The inhibitive efficiency of the phosphonium salt which has substitution radical of long carbon chain on benzene ring was higher than that for short carbon chain.Their inhibitive efficiencies increased with rising temperature. The phosphonium salts adsorbed chemically on aluminium surface in Al(ClO4)3 solution and their adsorption followed Langmuir isotherm. Possible models of adsorption of MPTPPB and PPTPPB were proposed.

Received: 25 June 1996

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HE Zuoqing; LI Jinliang (department of Chemistry; Xuzhou Teachers College). INHIBITIVE EFFECT OF AROMATIC PHOSPHONIUM SALTS ON CORROSION OF ALUMINIUM IN ALUMINIUM PERCHLORATE SOLUTION. J Chin Soc Corr Pro, 1996, 16(3): 235-240.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I3/235

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