Effect of cathodic polarization on the corrosion cracking rate in pipe steels

Ignatenko, V. E.; Маршаков, А. И.; Marichev, V. A.; Mikhailovskii, Yu. N.; Petrov, N. A.

doi:10.1007/bf02758332

Cited by 8 publications

(10 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where Р is the load applied to the specimen; l is the crack length; b and t are the specimen width and thickness, respectively. The K value was chosen on the plateau of the kinetic curve of X70 steel destruction, i.e., the plot of the crack growth rate versus K [34,35]. The crack growth rate (V) was determined from the slope of the plot of electric resistance of specimens (R cr ) vs. time ():…”

Section: Methodsmentioning

confidence: 99%

“…The purpose of this study was to reveal the effect of corrosion inhibitors belonging to various classes of organic compounds on the growth rate of a crack in pipe steel X70 in weakly acidic (pH 5.5) citrate buffer solution. This solution was already used before in studies of the SCC of pipe steels as a corrosive medium simulating a weakly acidic soil electrolyte, and it was shown that under static mechanical strain, a corrosion crack grew in a transgranular manner [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of organic corrosion inhibitors on the crack growth rate in pipe steel X70 in a weakly acidic solution

2019

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

The effect of a number of organic corrosion inhibitors (CIs) on the growth rate of a corrosion crack in pipe steel X70 in a weakly acidic (pH 5.5) citrate buffer solution in the absence and in the presence of 1 mM Na 2 S has been studied. A static straining load was applied to the specimens, with the stress intensity factor in the crack tip corresponding to the plateau of the kinetic curve of steel X70 destruction. The crack growth rate was determined from the change in the electric resistance of a specimen. The hydrogen penetration rate into metal was determined using the hydrogen electrochemical desorption method. It has been shown that CIs can considerably slow down the corrosion crack growth. In the solution containing no sulfide ions, the best protective properties are shown by IFKhAN-P-3 inhibitor (based on a salt of polyoxometalates with amines) and by a mixture of this inhibitor with phosphate (IFKhAN-P-8). In the presence of sulfide ions, the best inhibitors of stress corrosion cracking (SCC) of pipe steel include the IFKhAN-P-3 and IFKhAN-P-8 formulations, as well as modifications of the IFKhAN-29 inhibitor and a quaternary ammonium compound, Catamin AB. Good correlation is observed between the corrosion crack growth rate and the anodic dissolution rate of mild steel in electrolytes containing corrosion inhibitors. Only a poor correlation is observed between the crack growth rate and the rate of hydrogen penetration into the metal; the existence of this relationship is apparently due to the fact that all the CIs studied slow down not only the anodic dissolution of steel but also the penetration of hydrogen into the metal. The conclusion has been made that local anodic dissolution of the metal is the predominant mechanism of the growth of corrosion cracks in pipe steel in weakly acidic electrolytes. The ability of organic compounds to inhibit SCC can be estimated by the anodic current density at constant potential selected in the region of active dissolution of mild steel.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of organic corrosion inhibitors on the crack growth rate in pipe steel X70 in a weakly acidic solution

2019

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

show abstract

“…The stress intensity factor at the crack tip K (MPa·m 0.5 ) was carried out according to [15][16][17]. The initial value, K = 45 MPa·m 0.5 , was chosen on the plateau of the kinetic curve of X70 steel fracture curve, i.e., under the conditions where the crack growth rate nearly does not depend on K [14,17].…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the assumption on the synergistic effect of local metal dissolution and hydrogen absorption was often made [1]. It has been shown that the nature of the predominant mechanism of pH-neutral SCC of pipe steel X70 depends on the cyclic mechanical strain mode and on the electrode potential [14][15][16][17]. In fact, local dissolution of the metal is the predominant mechanism of SCC at relatively small amplitudes of cyclic strain variation and at the steel corrosion potentials in NS4 solution (pH 6.8).…”

Section: Introductionmentioning

confidence: 99%

“…In a weakly acidic buffer electrolyte with pH = 5.5 (i.e., at the threshold of the solution acidity corresponding to type II SCC), the crack growth occurs not only under cyclic strain by also under constant tensile stress. It was established that local metal dissolution is the predominant mechanism of transgranular crack growth [14][15][16][17][18]. Apparently, SCC in a weakly acidic buffer electrolyte is a special case of transgranular SCC of pipe steels and may demonstrate a number of specific features.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation