Corrosion behavior of magnesium in aqueous sulfate-containing electrolytes  

作　　者：Ainaz A.Abildina Andrey P.Kurbatov Yeldana G.Bakhytzhan Raigul Zh.Jumanova Akmaral M.Argimbayeva Khaisa Avchukir Gulmira S.Rakhymbay 

机构地区：[1]Center of Physical and Chemical Methods of Research and Analysis,Al-Farabi Kazakh National University,050012 Tole bi 96A,Almaty,Kazakhstan [2]Satbayev University,Satbayev 22,Almaty 050013,Kazakhstan [3]Al-Farabi Kazakh National University,Al-Farabi 71,Almaty 050040,Kazakhstan

出　　处：《Journal of Magnesium and Alloys》2023年第6期2125-2141,共17页镁合金学报（英文）

摘　　要：Studies have been conducted on the corrosive behavior of magnesium in aqueous sulfate electrolytes(0.5 mol/L MgSO_(4);0.5 mol/L Na2SO_(4);0.5 mol/L MgSO_(4)+0.5 mol/L Na2SO_(4)).The composition structure and morphology of the surface of the samples were studied using scanning electron microscopy in combination with X-ray spectral microanalysis.The results of the experiments showed the formation of a surface film inhomogeneous in its structure and composition with the main components Mg(OH)_(2)and Mg O.An increase in the exposure time of the electrode in solution led to the formation of microcracks on the main film caused by internal stress because of hydration of magnesium oxide produced during corrosion.The salt composition of the electrolyte determines the morphology and thickness of corrosion films due to differences in the solubility of the products formed during the hydrolysis of magnesium oxide and the kinetics of this process.Applying the methods of scanning electron microscopy X-ray electron analysis gravimetry and voltammetry it has been established that at various stages of magnesium corrosion in different electrolytes the growth rates of corrosion films are determined by the kinetics of magnesium oxide formation its hydration and dissolution followed by crystallization in the form of a brucite phase of loose sediments on the surface.

关 键 词：MAGNESIUM Corrosion Film ELECTROLYTE GRAVIMETRY Corrosion current 

分 类 号：TG178[金属学及工艺—金属表面处理]