The Use of Polarization Curves to Evaluate Stainless Steels in Highly Oxidizing Solutions

Pehkonen, Antero; Aromaa, Jari; Forsén, Olof; Virtanen, Jorma

doi:10.4028/www.scientific.net/msf.289-292.213

Cited by 3 publications

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“…For example the denotation (304L-IN-ox1) stays for a sample of a 304L SS, bright annealed, Table 2 shows the materials under investigation. The electrochemical apparatus was an Avesta cell [7,8]. The working electrolyte was 1 M Na 2 SO 4 aqueous solution.…”

Section: Methodsmentioning

confidence: 99%

Quantitative evaluation of oxide impurities in bright annealed stainless steels for deep drawing

et al. 2009

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Cold rolled SS is suitable for deep drawing operations, however the presence of resilient scales or oxides on the surface can damage the deep drawing punch/ die sets and emphasise creep phenomena of the material. These oxides can be formed during the hot rolling process preceding the cold one, or during the bright annealing performed between the steps of thickness reduction of the coil. Then a cleaning of the SS surface before drawing is necessary to have a longer life of the tools. The removal of the surface oxide scale can be performed with electrolytic pickling using neutral electrolytes, but the process parameters can be varied depending on the amount of oxides present on the surface of the starting material. To optimise the process efficiency, then, an univocal scale of the degree of oxidation of the bright annealed SS was determined through microscopical analysis and potentiodynamic tests.

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Section: Methodsmentioning

confidence: 99%

Quantitative evaluation of oxide impurities in bright annealed stainless steels for deep drawing

et al. 2009

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Corrosion Behavior of Sensitized 304 SS in Nitric Acid Medium Containing Oxidizing Ions

Priya

Mallika

Mudali

2014

Trans Indian Inst Met

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Influence of Oxidizing Ion Concentration on the Corrosion Resistance of Type 304L Stainless Steel in Nitric Acid Medium

Priya¹,

Ningshen²,

Mudali³

2012

Corrosion

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The influence of the oxidizing ions Fe3+ and Cr6+ with two different concentrations on the corrosion resistance of Type 304L (UNS S30403) stainless steel in 3 M and 6 M nitric acid (HNO3) medium has been determined. The corrosion resistance and passive film behavior of Type 304L stainless steel in the presence of oxidizing ions were evaluated using electrochemical potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and x-ray photoelectron spectroscopy (XPS) techniques. The corrosion resistance was observed to decrease with an increase in acid concentration and oxidizing ions. The concentrations of oxidizing ions were found to have a profound effect on the corrosion potential and passive current density when compared to that in nitric acid without oxidizing ions. XPS results revealed a significant reduction of chromium(III) oxide (Cr2O3) on the passive film as the concentration of oxidizing ions in nitric acid increases. An oxide layer thickness of ~13 nm enriched with iron oxide could be estimated for the passivated sample in the nitric acid medium with higher oxidizing ion concentration compared to 1 nm thick oxide film in nitric acid without oxidizing ions. Both XPS and EIS analyses confirmed the detrimental effect of oxidizing species on the passive film leading to increased corrosion with an increase in nitric acid and oxidizing ion concentration. The corrosion results could be correlated with microstructural observations.

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The Use of Polarization Curves to Evaluate Stainless Steels in Highly Oxidizing Solutions

Cited by 3 publications

References 0 publications

Quantitative evaluation of oxide impurities in bright annealed stainless steels for deep drawing

Quantitative evaluation of oxide impurities in bright annealed stainless steels for deep drawing

Corrosion Behavior of Sensitized 304 SS in Nitric Acid Medium Containing Oxidizing Ions

Influence of Oxidizing Ion Concentration on the Corrosion Resistance of Type 304L Stainless Steel in Nitric Acid Medium

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