Corrosion Inhibiton Mechanism of Cerium(III) for Aluminum Alloy

J Chin Soc Corr Pro

2006, Vol. 26

Issue (1): 53-58 DOI:

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Corrosion Inhibiton Mechanism of Cerium(III) for Aluminum Alloy

Baoshan Gu;Jianhua Liu;Xiaochun Ji

北京钢铁研究总院

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Abstract By using a split cell to separate anode and cathode as well as measuring the change of net-electric current between the two electrodes caused by the change of the amount of oxygen in the solution and the addition of CeCl3.The influence of CeCl3 on corrosion behavior of B95 super-strength aluminum alloy in the 0.1 mol/L NaCl solution was studied.Meanwhile,a further discussion about Ce salt inhibition mechanism was carried out by revealing the features of electrode surface with the help of SEM and X-ray energy-dispersive spectrometry (EDS) and resorting to other electric chemical techniques,such as potential-time curve,polarization curve and so on .The results showed that alayer of uneven conversion coatings could appear on the surface of B95 alloy after being dealt with by Ce salt;the dynamics of coating-formation involved two stages:the solution of aluminum alloys and coating-formation fterwards;the cerium conversion coatings were mainly composed of Ce,O and Al elements;the experiment with completely submerging into the solution of 3.5% NaCl showed that the corrosion rate of B95 could be reduced by several hundre d times and the anti-corrosion performance of aluminum alloys improved greatly when CeCl3 were added to the solution.As a result CeCl3 proves to be an excellent coating-formation material and aluminum alloy corrosion inhibitor.

Key words: Aluminium alloys Cerium conversion coatings Inhibiton mechanism Split cell

Received: 12 November 2004

ZTFLH:	O646.6
	TG133.2

Corresponding Authors: Baoshan Gu E-mail: gubs@263.net

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Baoshan Gu; Jianhua Liu; Xiaochun Ji. Corrosion Inhibiton Mechanism of Cerium(III) for Aluminum Alloy. J Chin Soc Corr Pro, 2006, 26(1): 53-58 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I1/53

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