Application of electrochemical methods for the investigation of intergranular corrosion welded joint austenitic stainless steel 19Cr-9Ni

Jegdić, Bore; Alil, Ana; Milutinović, Zlatan; Odanović, Zoran; Gligorijević, Bojan; Katavić, Boris

doi:10.2298/hemind101122005j

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…Based on the results shown in Figures and and in Table , it can be concluded that the base metal is resistant to intergranular corrosion, while the HAZ is slightly susceptible. In general, a stainless steel that is susceptible to intergranular corrosion is also susceptible to stress corrosion cracking; therefore, the DL‐EPR method can be used to estimate the susceptibility of a stainless steel to stress corrosion cracking …”

Section: Resultsmentioning

confidence: 99%

“…In general, a stainless steel that is susceptible to intergranular corrosion is also susceptible to stress corrosion cracking; therefore, the DL-EPR method can be used to estimate the susceptibility of a stainless steel to stress corrosion cracking. [41,49] The SEM micrographs of the stainless steel surface after the intergranular corrosion testing are shown in Figure 3. A slight dissolution of the grain boundary areas in the HAZ occurred in the regions depleted in chromium, as it can be seen in Figure 3b.…”

Section: Results Of the Intergranular Corrosion Testingmentioning

confidence: 99%

“…Testing stainless steels susceptibility to intergranular corrosion is often performed using the method of electrochemical potentiokinetic reactivation with a double loop, DL‐EPR . The DL‐EPR method, developed by Čihal, has found its application in testing the susceptibility to intergranular corrosion of not only austenitic stainless steels, but also ferritic stainless steels, duplex stainless steels, etc.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the welding current intensity and nitrogen content on the corrosion resistance of austenitic stainless steels

Jegdić

Bobić

Radojković

et al. 2018

Materials & Corrosion

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The resistance to pitting and intergranular corrosion of the welded joint of X5CrNi18‐10 austenitic stainless steel is analyzed in this paper. The resistance of the welded joint to intergranular corrosion does not depend on the nitrogen content in the shielding gas. It depends on the heat input into the welded joint, that is, on the welding current intensity. The resistance to pitting corrosion depends on the content of nitrogen in the shielding gas and on the welding current intensity. With the increase in the nitrogen content in the shielding gas, the resistance of the heat affected zone (HAZ) to pitting corrosion increases. The welding current intensity (heat input into the welded joint) shows two opposite effects. On the one hand, the increase of the heat input into the welded joint causes a more intensive precipitation of chromium carbides along the grain boundaries, which then leads to depletion in chromium of the grain boundary areas. The sensitization degree of the HAZ is thus increased and the formation of pits easier. On the other hand, with the increase in the welding current intensity, diffusion of nitrogen from the weld metal into the HAZ is facilitated, which contributes to the increased HAZ resistance to pitting corrosion. Possible mechanisms for increasing the HAZ resistance to pitting corrosion in the presence of nitrogen are also considered.

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Section: Resultsmentioning

confidence: 99%

Section: Results Of the Intergranular Corrosion Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the welding current intensity and nitrogen content on the corrosion resistance of austenitic stainless steels

Jegdić

Bobić

Radojković

et al. 2018

Materials & Corrosion

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“…DL EPR metodu je razradio V. Čihal [6,12] i našla je primenu za ispitivanje sklonosti prema interkristalnoj koroziji ne samo austenitnih čelika [13], već i feritnih [7], duplex nerđajućih čelika [14], itd. DL EPR metoda se primenjuje za ispitivanje sklonosti zavarenih spojeva nerđajućih čelika prema interkristalnoj koroziji, kao i za ispitivanje sklonosti prema naponskoj koroziji [11].…”

Section: Slika 1 Primer Ispitivanja Sklonosti Prema Interkristalnoj unclassified

Influence of welding current intensity on susceptibility to intergranular corrosion in welded joints of stainless steel

Jegdic¹,

Bobic²,

Alić³

2017

Zavarivanje i zavarene konstrukcije

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IzvodIspitana je sklonost prema interkristalnoj koroziji zavarenog spoja austenitnog nerđajućeg čelika X5Cr-Ni18-10. Zavareni spoj je formiran pri različitim jačinama struje zavarivanja (110 A, 130 A i 150 A). Ispitivanja su vršena metodom elektrohemijske potenciokinetičke reaktivacije sa dvostrukom petljom (DL EPR metoda), na osnovnom metalu i u zoni uticaja toplote (ZUT). Osnovni metal je otporan prema interkristalnoj koroziji. Zona uticaja toplote formirana pri zavarivanju strujom jačine 150 A pokazuje najveću sklonost prema interkristalnoj koroziji. Sklonost prema interkristalnoj koroziji je znatno niža pri zavarivanju manjim jačinama struje. Pokazatelj sklonosti prema interkristalnoj koroziji (Q r /Q p ) GBA je ~ 6 puta veći za zonu uticaja toplote (pri jačini struje zavarivanja od 150 A) nego za osnovni metal. Na osnovu prikazanih rezultata može se zaključiti da jačina struje zavarivanja u velikoj meri utiče na sklonost zavarenog spoja nerđajućeg čelika X5CrNi18-10 prema interkristalnoj koroziji. AbstractSusceptibility to intergranular corrosion in welded joints of austenitic stainless steel X5Cr-Ni18-10 was tested. The welding was performed with different intensity of welding current (110 A, 130 A and 150 A). The tests were performed using electrochemical potentiokinetic reactivation method with double loop (DL EPR method) on the base metal and in the heat affected zone. The results obtained by the DL EPR method show that the heat affected zone formed by welding with 150 A has the highest susceptibility to intergranular corrosion. The susceptibility to intergranular corrosion is considerably lower when applying smaller welding current. The base metal is resistant to intergranular corrosion. The indicator of susceptibility to intergranular corrosion (Qr/Qp) GBA is ~ 6 times higher for the heat affected zone (at 150 A welding current intensity) than for the base metal. Obtained testing results show that the welding current intensity greatly influences the susceptibility to intergranular corrosion in welded joints of stainless steel X5Cr-Ni18-10. UVOD Interkristalna korozija je vid lokalne korozije koji se manifestuje rastvaranjem oblasti granica zrna. Pri laganom hlađenju ili zagrevanju austenitnih nerđajućih čelika, u temperaturnom intervalu od 420 o C do 820 o C, po granicama zrna se izdvajaju karbidi bogati hromom, prvenstveno M 23 C 6 [1][2][3]. Izdvajanje karbida hroma izaziva osiromašenje prigraničnih oblasti zrna hromom. To je posledica spore difuzije hroma u austenitu u navedenom temperaturnom intervalu. Ako je sadržaj hroma manji od sadržaja koji je neophodan za održavanje zaštitnog pasivnog filma, oblast neposredno uz granicu zrna postaje senzibilizovana i podložna interkristalnoj koroziji. Prigranične zone, siromašne hromom, imaju veću brzinu rastvaranja u odnosu na ostale oblasti zrna [1]. Senzibilizacija nerđajućeg čelika prema interkristalnoj koroziji se najčešće javlja u

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“…Also, the ratio of the current peak value in the reverse part of the loop (reactivation) and the passivation current peak value in the activation part of the loop can represent a measure of the susceptibility to intergranular corrosion. DL EPR method can be applied with certain modifications to test susceptibility to intergranular corrosion of other types of stainless steels [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Determination of susceptibility to intergranular corrosion of stainless steels type X5CrNi18-10 in field

Jegdić

Bobić

2016

Metall Mater Eng

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In this paper, the DL EPR method (electrochemical potentiokinetic reactivation with double loop) was modified and used to study the susceptibility to intergranular corrosion and stress corrosion cracking of a stainless steel type X5CrNi18-10. The tests were performed in a special electrochemical cell, with the electrolyte in the gel form. Modified DL EPR method is characterized by simple and high accuracy measurements as well as repeatability of the test results. The indicator of susceptibility to intergranular corrosion (Q r /Q p ) GBA obtained by modified DL EPR method is in a very good agreement with the same indicator obtained by standard DL EPR method. The modified DL EPR method is quantitative and highly selective method. Small differences in the susceptibility of the stainless steel type CrNi18-10 to intergranular corrosion and stress corrosion cracking can be determined. Test results can be obtained in a short time. The cost of tests performed by modified DL EPR method is much lower than the cost of tests by conventional chemical methods. Modified DL EPR method can be applied in the field on the stainless steels constructions.

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Application of electrochemical methods for the investigation of intergranular corrosion welded joint austenitic stainless steel 19Cr-9Ni

Cited by 3 publications

References 6 publications

Influence of the welding current intensity and nitrogen content on the corrosion resistance of austenitic stainless steels

Influence of the welding current intensity and nitrogen content on the corrosion resistance of austenitic stainless steels

Influence of welding current intensity on susceptibility to intergranular corrosion in welded joints of stainless steel

Determination of susceptibility to intergranular corrosion of stainless steels type X5CrNi18-10 in field

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