The ability of sodium linear-saturated carboxylates to protect magnesium alloys against aqueous corrosion was characterized. Electrochemical measurements of polarization resistance (Rp) and corrosion current (Icorr) showed the inhibition efficiency of these compounds is a function of their concentration and of the length of the aliphatic chain. In every case studied, the efficiency increased with immersion time. At pH 8, the best inhibiting behavior was observed with 0.05 M sodium undecanoate. The potential-pH diagram of magnesium in an aqueous solution containing undecanoate anions was generated based upon the solubility determined for magnesium undecanoate (Mg[CH3(CH2)9COO]2). According to this diagram, the very low corrosion rate was suspected to result from formation of Mg(CH3[CH2]9COO)2. Infrared spectrometry carried out on both the synthesized magnesium carboxylate and the product from the magnesium alloy surface after inhibitive treatment confirmed this hypothesis.
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1 June 1998
Research Article|
June 01 1998
Corrosion Inhibition of Rapidly Solidified Mg-3% Zn-15% Al Magnesium Alloy with Sodium Carboxylates
D. Daloz;
D. Daloz
*Laboratoire de Métallurgie Physique & Sciences des Matériaux, URA 155, Ecole des Mines, Parc de Saurupt, F-54042 Nancy Cedex,
France
.
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P. Steinmetz;
P. Steinmetz
**Laboratoire de Chimie du Solide Minéral, URA 158, Université Henri Poincaré de Nancy, BP 239, F-54505 Vandoeuvre les Nancy cedex,
France
.
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G. Michot
G. Michot
*Laboratoire de Métallurgie Physique & Sciences des Matériaux, URA 155, Ecole des Mines, Parc de Saurupt, F-54042 Nancy Cedex,
France
.
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Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
1998
CORROSION (1998) 54 (6): 444–450.
Citation
D. Daloz, C. Rapin, P. Steinmetz, G. Michot; Corrosion Inhibition of Rapidly Solidified Mg-3% Zn-15% Al Magnesium Alloy with Sodium Carboxylates. CORROSION 1 June 1998; 54 (6): 444–450. https://doi.org/10.5006/1.3284872
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