Effects of microstructure alteration on corrosion behavior of welded joint in API X70 pipeline steel

Bordbar, Sajjad; Alizadeh, Mostafa; Hashemi, S. H.

doi:10.1016/j.matdes.2012.09.051

Cited by 102 publications

(60 citation statements)

References 24 publications

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“…An electrochemical equivalent circuit used to fit the experimental data is shown in Fig. 7 [3,10,19]. In this circuit, R s represents the solution resistance, R 1 the film resistance due to the formation of corrosion products, R 2 the charge transfer resistance, CPE 1 the constant phase element of the corrosion products layer, and CPE 2 the constant phase element of the steel surface.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

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Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Guo

Liu

et al. 2015

Int J Miner Metall Mater

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The effect of microstructure variation on the corrosion behavior of high-strength low-alloy (HSLA) steel was investigated. The protective property of the corrosion product layer was also explored. Experimental results reveal that the type of microstructure has significant effect on the corrosion resistance of HSLA steel. The measurement results of weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy indicate that the steel with acicular ferrite microstructure exhibits the lowest corrosion rate. Martensite exhibits a reduced corrosion resistance compared with polygonal ferrite. It is found that the surface of the acicular ferrite specimen uniformly covered by corrosion products is seemingly denser and more compact than those of the other two microstructures, and can provide some amount of protection to the steel; thus, the charge transfer resistance and modulus values of the acicular ferrite specimen are the largest. However, corrosion products on martensite and polygonal ferrite are generally loose, porous, and defective, and can provide minor protectiveness; thus, the charge transfer resistance values for polygonal ferrite and martensite are lower.

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Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

“…Although numerous previous studies have been reported concerning the corrosion behavior of HSLA steel [9][10][11][12][13][14][15][16][17], limited investigations are focused on the effect of microstructure variation on the corrosion behavior of HSLA steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Guo

Liu

et al. 2015

Int J Miner Metall Mater

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“…When the potential increased to -0.67V, the current density began to drop, which can be called passive phenomenon. This may be due to the production by corrosion products, FeCO 3 and Fe(OH) 2 [3,16], as follows: Moreover, the current density began to increase again when the potential increased to about -0.51V which may be induced by the dissolution of Fe(OH) 2 in HCO − 3 , as follows:…”

Section: Slow Strain Rate Tensile (Ssrt) Testsmentioning

confidence: 99%

Effects Of Anodic Protection On SCC Behavior Of X80 Pipeline Steel In High-pH Carbonate-Bicarbonate Solution

Zhao¹,

Zou²,

Xia³

et al. 2015

Archives of Metallurgy and Materials

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The potentiodynamic polarization test and slow strain rate tensile tests of X80 pipeline steel were performed in 0.5M Na 2 CO 3 -1M NaHCO 3 solution to study the electrochemical and stress corrosion cracking properties. The results of potentiodynamic polarization test show that there is an obvious stable passive region, about from 0v to 0.8V (SCE), indicating that anodic protection is feasible. The results of slow strain rate tensile tests show that the stress corrosion cracking sensibility is high and cathodic protection effect is restricted due to the hydrogen permeation. However, the elongation, yielding strength and tensile strength all increase with anodic protection. The higher anodic protection potential in the stable passive region is benefit to improve tensile strength and yielding strength. However, the higher elongation is obtained at 0.5V (SCE) anodic protection potential.Keywords: X80 pipeline steel, stress corrosion cracking, high-pH solution, anodic protection Badania polaryzacji potencjodyniamicznej oraz próby powolnego rozciągania (SSRT) przeprowadzono na stali typu X80 w roztworze 0,5M Na 2 CO 3 -1M NaHCO 3 . Określono odporność na korozję elektrochemiczną oraz zbadano zjawisko naprężenio-wego pękania korozyjnego. Rezultaty badań polaryzacji potencjodynamicznej wykazały istnienie stabilnego obszaru pasywacji w zakresie potencjału od 0V do 0,8V (SCE: półogniwo odniesienia -elektroda kalomelowa). Próby powolnego rozciągania pokazały wysoką wrażliwość materiału na naprężeniowe pękanie korozyjne i ograniczenia ochrony katodowej w związku z przenikaniem wodoru. Ochrona anodowa natomiast, zwiększa znacząco wydłużenie próbki, granicę plastyczności oraz wytrzymałość na rozciąganie. Ponadto zwiększanie wartości potencjału w stabilnym obszarze pasywacji dodatkowo poprawia te właściwości.

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“…Several studies have shown that the corrosion behavior of HAZ was different from BM and the corrosion resistance decreased after welding thermal cycle [14][15][16][17][18][19]. Dastgiri [14] carried out failure analysis of the welded pipe made of AISI 1518 low carbon steel based on the available documents, metallographic studies and corrosion behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang [16,17] researched the corrosion behavior of welded X70 pipeline steel by polarization, electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Bordbar [18] investigated the effect of heat treatment on the corrosion properties and the protective properties of the corrosion products layer of X70 welded joint by EIS measurements. Verma and Taiwade [19] assessed the intergranular corrosion resistance and pitting characteristics of the dissimilar welds between 22% Cr series duplex 2205 and 316L austenitic stainless steel by polarization measurements.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

Zhang

Zhao

Shu

et al. 2017

Metals

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Abstract:The microstructure evolution and the corrosion behavior of welding heat affected zone (HAZ) of Q315NS steel in 50 wt % H 2 SO 4 at 20 • C was investigated with thermal simulation technique, surface analysis and electrochemical tests. The microstructure of ferrite and pearlite was observed in base metal (BM), fine grained region (FGHAZ) and inter critical region (ICHAZ) while coarse grained region (CGHAZ) consisted of granular bainite. The CGHAZ exhibited the highest microhardness and the largest average grain size. The passivation process occurred on the surface of all specimens. Different microstructure give birth to different corrosion behaviors between CGHAZ and BM, FGHAZ, ICHAZ. The dense oxide film were formed on the surface of ferrite while oxide film with micro voids were formed on the surface of pearlite in BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 12 h. The rod-shaped corrosion product was formed on the surface of CGHAZ while the porous-structured corrosion product was formed on the surface of BM, FGHAZ and ICHAZ after immersion in 50 wt % H 2 SO 4 solution for 72 h. The corrosion resistance of BM, CGHAZ, FGHAZ and ICHAZ increased during the first 12 h and then declined slowly with increasing immersion time. The BM had the best corrosion resistance while the CGHAZ had the lowest corrosion resistance throughout the corrosion process.

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Effects of microstructure alteration on corrosion behavior of welded joint in API X70 pipeline steel

Cited by 102 publications

References 24 publications

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Effects Of Anodic Protection On SCC Behavior Of X80 Pipeline Steel In High-pH Carbonate-Bicarbonate Solution

Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

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