STUDY ON CORROSION PRODUCT FILM OF MAGNESIUM-ALUMINUM ALLOYS CONTAININGRARE-EARTH ELEMENT IN NaCl SOLUTION

J Chin Soc Corr Pro

2002, Vol. 22

Issue (3): 167-171 DOI:

Research Report

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STUDY ON CORROSION PRODUCT FILM OF MAGNESIUM-ALUMINUM ALLOYS CONTAININGRARE-EARTH ELEMENT IN NaCl SOLUTION

Liang Huang;Yuanwei` Huang;Chen Wang

上海市中科院上海冶金所

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Liang Huang; Yuanwei` Huang; Chen Wang. STUDY ON CORROSION PRODUCT FILM OF MAGNESIUM-ALUMINUM ALLOYS CONTAININGRARE-EARTH ELEMENT IN NaCl SOLUTION. J Chin Soc Corr Pro, 2002, 22(3): 167-171 .

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Abstract The corrosion resistance of magnesium-aluminum allo ys is closely related to the corrosion product film formed on the alloy's surfac e.The morphology and structure of the corrosion product film on pure Mg,Mg-Al  and Mg-Al-RE alloys in the solution containing Cl\+- were examined by the var ious sur face analysis techniques including EMPA,EDS,SEM,TEM,XRD,AES etc.The results indi cated that the elemental aluminum is conducive to the corrosion resistance of al loys,but its beneficial effect is limited and unstable.The RE addition can obvi ously increase the Al concentration in corrosion product film.Also,the distribut i on of Al in corrosion product film of Mg-Al-RE alloys was broadened due to the a dd ition of RE.It indicated that the RE element promoted the formation of protectiv e film containing elemental Al.

Key words: Mg-Al alloy NaCl solution corrosion product film rare earth element

Received: 03 November 2000

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