The Double Loop Reactivation Method for Detecting Sensitization in AISI 304 Stainless Steels

Majidi, Azar P.; Streicher, Michael A.

doi:10.5006/1.3581921

Cited by 231 publications

(128 citation statements)

References 0 publications

Supporting

Mentioning

112

Contrasting

Unclassified

Order By: Relevance

“…The % DOS was then computed as the ratio of (Ir/Ia) x100. 18,19) EPMA line scans of two samples each from both the steels was performed in conjunction with SEM using JEOL 8 600 M Electron Probe Micro analyzer. The line scan determines the chemical composition of the alloying elements across the grain boundaries.…”

Section: Experimental Workmentioning

confidence: 99%

A Comparative Study of Intergranular Corrosion of AISI 304 Stainless Steel and Chrome-Manganese Austenitic Stainless Steel

et al. 2012

View full text Add to dashboard Cite

The use of Chrome-Manganese austenitic stainless steel (Cr-Mn ASS) has tremendously increased in past few years in applications like home accessories, office appliances, light poles, etc and it is serving as an alternative to 300 series. But, the study related to sensitization behavior of these steels is scanty. Therefore, this paper aims a systematic comparison on intergranular corrosion of AISI 304 stainless steel and Cr-Mn ASS. The qualitative and quantitative comparison of degree of sensitization of these steels was carried out on the basis of optical microscopy (ASTM standard A-262 practice A test) and electrochemical test (double loop electrochemical potentiokinetic reactivation (DLEPR)) respectively. The isothermal time-temperature-sensitization diagrams were used to compare the effect of heat treatment on sensitization zone of both the steels. The DLEPR results showed that the AISI 304 SS starts to recover from sensitization when ageing time is prolonged beyond 2 880 min. (at 700°C), whereas for Cr-Mn ASS, the degree of sensitization keeps on increasing to a very high value of 60.70% (11 520 min.). Chromium depleted zone was identified and compared using Electron Probe Micro-analyzer (EPMA) line scan of both the steels. The depleted region of sensitized Cr-Mn ASS is found to be much wider than that of AISI 304 SS.

show abstract

Section: Experimental Workmentioning

confidence: 99%

A Comparative Study of Intergranular Corrosion of AISI 304 Stainless Steel and Chrome-Manganese Austenitic Stainless Steel

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The ratio of the reactivation current (I r ) to the activation current (I a ) peaks, I r =I a , was taken as the DOS. 10) The potential values reported in this work are referred to the SCE.…”

Section: Methodsmentioning

confidence: 99%

“…The DOS in ASS's is commonly assessed by the Double Loop Electrochemical Potentiokinetic Reactivation test (DL-EPR), which is a quantitative and reliable method with excellent reproducibility. 10,11) A potentiostat/galvanostat was used with a conventional three electrodes electrochemical cell; a saturated calomel electrode (SCE) as reference electrode, a graphite bar as auxiliary electrode and the ASS samples as working electrode. The DL-EPR tests were conducted in 0.5M H 2 SO 4 + 0.01M KSCN solution at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Enhancing Corrosion Resistance of 304 Stainless Steel GMA Welds with Electromagnetic Interaction

et al. 2011

View full text Add to dashboard Cite

Plates of AISI 304 stainless steel were gas metal arc welded under the effect of an electromagnetic interaction. Samples of the heat affected zone were subjected to the double loop electrochemical potentiokinetic reactivation technique to evaluate the degree of sensitization (DOS). The as-received plates had a significant DOS whereas samples welded under electromagnetic interaction presented lower DOS as compared with samples plainly welded. The reduction in the DOS suggests that the electromagnetic interaction enables Cr redistribution in the austenitic grains during welding reducing Cr depleted zones.

show abstract

“…Modi cations to the conventional DL-EPR test have been made in the electrolyte depending on the type of alloy, but the most common depassivator or activator in the dissolution of metals is potassium thiocyanate. This compound is used due to its catalytic effect in diluted solutions containing sulfuric acid, because potassium thiocyanate promotes the dissolution of the passive layer in chromium depleted zones, increasing the current density during the anodic dissolution in the activation process and subsequently along the grain boundaries during the reactivation loop 12) . It is established that a disproportionate reaction of the decomposition of potassium thiocyanate takes place producing the adsorption of S in the surface of the sample, which is stable in the potential range of anodic dissolution, where S compounds are reduced according to the reaction…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Electrolyte Composition in the Degree of Sensitization in AISI 347H Stainless Steel

et al. 2017

View full text Add to dashboard Cite

This study evaluated the suitability of the depassivator in revealing low degrees of sensitization (DOS) in samples of wrought AISI 347H austenitic stainless steel in the as-received condition and solution heat treated (SHT) at 1050 C. Assessment of the electrolyte composition was performed by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test at room temperature. The electrolyte 1.0M H 2 SO 4 + 0.50M HCl was found to be adequate for detecting low DOS. Microstructural characterization of the as-received material revealed the presence of Cr-rich carbides. These carbides were responsible of the susceptibility to IGC.

show abstract

The Double Loop Reactivation Method for Detecting Sensitization in AISI 304 Stainless Steels

Cited by 231 publications

References 0 publications

A Comparative Study of Intergranular Corrosion of AISI 304 Stainless Steel and Chrome-Manganese Austenitic Stainless Steel

A Comparative Study of Intergranular Corrosion of AISI 304 Stainless Steel and Chrome-Manganese Austenitic Stainless Steel

Enhancing Corrosion Resistance of 304 Stainless Steel GMA Welds with Electromagnetic Interaction

Assessment of the Electrolyte Composition in the Degree of Sensitization in AISI 347H Stainless Steel

Contact Info

Product

Resources

About