Pitting and Intergranular Corrosion Resistance of AISI Type 301LN Stainless Steels |
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Authors: | S Ningshen U Kamachi Mudali |
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Affiliation: | (1) Corrosion Science and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India; |
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Abstract: | The pitting and intergranular corrosion (IGC) resistance of AISI type 301LN stainless steels were evaluated using ASTM methods,
anodic polarization, and electrochemical impedance techniques. The IGC results indicated that the microstructure of the samples
after sensitization heat treatment at 675 °C for 1 h shows step or dual structure for both imported and indigenous materials
indicating insignificant Cr23C6 precipitation. The results of immersion tests in boiling 6% copper sulfate + 16% sulfuric acid + copper solution for 24 h
followed by the bend test (ASTM A262 Practice-E method) indicated no crack formation in any of the tested specimens. Pitting
corrosion resistance carried out in 6% FeCl3 solution at different temperatures of 22 ± 2 and 50 ± 2 °C (ASTM G 48) up to the period of 72 h revealed pitting corrosion
attack in all the investigated alloys. The potentiodynamic anodic polarization results in 0.5 M NaCl revealed variation in
passive current density and pitting potential depending on the alloy chemistry and metallurgical condition. The passive film
properties studied by electrochemical impedance spectroscopy (EIS) correlated well with the polarization results. The x-ray
diffraction (XRD) results revealed the presence of austenite (γ) and martensite (α′) phases depending on the material condition.
The suitability of three indigenously developed AISI type 301LN stainless steels were compared with imported type 301LN stainless
steel and the results are highlighted in this article. |
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