Electrochemical behaviour of the antimony electrode in sulphuric acid solutions—III. identification of corrosion products after long-term polarization

Characterization of the anodic growth and dissolution of antimony oxide films

“…Pavlov et al [5][6][7] have determined by electrochemical, XPD and SEM measurements that the corrosion process in sulphuric solutions takes place at open circuit as well as at low overpotentials. The passive layers formed in the early stages of oxidation consist of amorphous antimony oxide or hydroxide but at long oxidation times, aggregates or crystals are formed.…”

“…Most of the work on the electrochemical behaviour of Sb found in the literature has been performed in sulphuric acid solutions [4][5][6][7][8][9][10] although some studies in other acidic electrolytes such as phosphoric acid solutions, have been published [11,12].…”

Characterization of growth of anodic antimony oxide films by ellipsometry and XPS

“…The electrochemical behaviour of pure antimony has been mainly studied in sulphuric acid solutions [2][3][4][5][6][7][8], although some studies in other media as phosphoric acid or phosphate solutions [9][10][11] are found. In concentrated sulphuric solutions, Laihonen et al [3] have established that Sb dissolves via the formation of trivalent antimony species (SbO + ) and even though the electrode potential is by far more positive than the equilibrium potential of the Sb(V)/Sb(III) couple, no pentavalent Sb species are formed.…”

“…In order to determine the composition of the anodic layer formed during long-term polarization of antimony in concentrated sulphuric acid solutions, Laitinen et al [6] have employed SEM, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. SEM results indicate that for films formed after 0.25-3 h of anodization, an amorphous layer consisting of antimony oxide and/or hydroxide is detected.…”

Effect of tungsten on the corrosion behavior of sulfuric acid-resistant steels for flue gas desulfurization system

“…Consequently, according to the results of XPS analyses, the rust layers consisted of FeO, FeOOH, Sb 2 O 5 , WO 3 , and CuO. The addition of Sb enhanced the corrosion resistance by forming Sb 2 O 3 or Sb 2 O 5 on the surface in the sulfuric acid solution [13][14][15]. The addition of Cu enhanced the corrosion resistance by increasing the concentration of Cu and Cu oxides on the surface in the sulfuric acid solution [16,17].…”