scholarly journals Effect of Corrosion Temperature on the Corrosion of Q235 Steel and 16Mn Steel in Sodium Aluminate Solutions

ACS Omega ◽  
2021 ◽  
Author(s):  
Bianli Quan ◽  
Junqi Li ◽  
Chaoyi Chen
Keyword(s):  
Sodium Aluminate ◽  
Q235 Steel ◽  
16Mn Steel

scholarly journals Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 753
Author(s):  
Bianli Quan ◽  
Junqi Li ◽  
Chaoyi Chen
Keyword(s):  
Charge Transfer ◽  
Iron Sulfide ◽  
Sodium Aluminate ◽  
Corrosion Products ◽  
Alumina Production ◽  
Steel Electrode ◽  
Aluminate Solution ◽  
Q235 Steel ◽  
Sodium Aluminate Solution ◽  
Corrosion Time

During Bayer alumina production with high-sulfur bauxite, the sulfide ions in the sodium aluminate solution caused serious corrosion to Q235 steel, which is the material of the tank equipment. This study investigates the effect of corrosion time on Q235 steel synergistic corrosion in sodium aluminate solution using the weight-loss method and electrochemical measurements. The results indicate that the corrosion rate decreases sharply, the rate equation satisfies the mathematical model of power function at the initial stage of corrosion, and the transformation of unstable iron sulfide to stable iron oxide at the later stage results in the decrease in sulfur content in the corrosion products and surface pseudo-passivation. There are two main types of corrosion products, as follows: one is the octahedral crystal particle, which is composed of Fe2O3, Fe3O4, Al2O3 and NaFeO2, and the other is the interlayer corrosion between the surface layer and the matrix, which is composed of FeS, FeS2 and MnS2. At day 3, the dynamics of the Q235 steel electrode is controlled by charge transfer and ion diffusion. However, at other times the dynamics are mainly controlled by charge transfer.

A transmission electron microscopic study of structural transitions in fast ionic conductors

1987 ◽  
Vol 45 ◽  
pp. 156-157
Author(s):  
R. B. Queenan ◽  
P. K. Davies
Keyword(s):  
Optical Properties ◽  
Ionic Conduction ◽  
Recent Observation ◽  
Ionic Conductivities ◽  
Sodium Aluminate ◽  
Two Dimensions ◽  
Ionic Conductors ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Trivalent Cations

Na ß“-alumina (Na1.67Mg67Al10.33O17) is a non-stoichiometric sodium aluminate which exhibits fast ionic conduction of the Na+ ions in two dimensions. The Na+ ions can be exchanged with a variety of mono-, di-, and trivalent cations. The resulting exchanged materials also show high ionic conductivities.Considerable interest in the Na+-Nd3+-ß“-aluminas has been generated as a result of the recent observation of lasing in the pulsed and cw modes. A recent TEM investigation on a 100% exchanged Nd ß“-alumina sample found evidence for the intergrowth of two different structure types. Microdiffraction revealed an ordered phase coexisting with an apparently disordered phase, in which the cations are completely randomized in two dimensions. If an order-disorder transition is present then the cooling rates would be expected to affect the microstructures of these materials which may in turn affect the optical properties. The purpose of this work was to investigate the affect of thermal treatments upon the micro-structural and optical properties of these materials.

Synthesis of carbonate esters by carboxymethylation using NaAlO2 as a highly active heterogeneous catalyst

2018 ◽  
Author(s):  
Sreerangappa Ramesh ◽  
Kiran Indukuri ◽  
Olivier Riant ◽  
Damien Debecker
Keyword(s):  
Heterogeneous Catalyst ◽  
Dimethyl Carbonate ◽  
Sodium Aluminate ◽  
High Yield ◽  
Solid Catalyst ◽  
Highly Active ◽  
Aromatic Alcohols ◽  
Green Conditions ◽  
Mixed Carbonate

<p>Sodium aluminate is presented as a highly active heterogeneous catalyst able to convert a range of alcohols into the corresponding mixed carbonate esters, in high yield and under green conditions. The reaction is carried out using dimethyl carbonate both as a reactant and solvent, at 90°C. Allylic, aliphatic and aromatic alcohols are converted in good yields. The solid catalyst is shown to be truly heterogeneous, resistant to leaching, and recyclable. </p>

Effects of magnesium chloride polluted soils on underground Q235 steel pipelines

2015 ◽  
Vol 57 (10) ◽  
pp. 850-858
Author(s):  
Pengju Han ◽  
Y. Frank Chen ◽  
Xiaohong Bai ◽  
Bin He
Keyword(s):  
Magnesium Chloride ◽  
Polluted Soils ◽  
Q235 Steel
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