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Abstract

The effect of (1,3-Dioxolan-2-ylmethyl)-triphenylphosphonium bromide (DTPB) on the zinc corrosion in 0.5 mol·L-1 citric acid solution was investigated at 30 oC using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. An ecofriendly bath was used for acid cleaning of zinc, which has not been widely used in literatures. The results showed that DTPB could serve as an effective inhibitor for the zinc corrosion in a citric acid solution with the inhibition efficiency of 98.9% at the DTPB concentration of 3×10-3 mol·L-1. A synergistic effect between DTPB and potassium iodide (KI) enhanced the inhibition capability of DTPB, and better inhibition efficiency was achieved as compared with that by using DTPB alone. The synergism parameter had a value of 1.2 and was found to decrease with temperature. An inhibition mechanism is proposed by which KI acts as an adsorption mediator for bonding metal surface and DTPB.

Graphical Abstract

Keywords

zinc, polarization, EIS, acid corrosion, synergism

Publication Date

2017-08-25

Online Available Date

2016-04-14

Revised Date

2016-03-10

Received Date

2015-12-22

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