X80 steel exhibits two different steady states in 0.5molL-¹ NaHCO3+0.25molL-¹ Na2CO3 solution with and without precathodic polarisation, which are activation and passivation respectively. When the steel is immersed in the solution, self-passivation occurs. However, when the steel is precathodically polarised with -1.3 V(SCE), it suffers from active corrosion. To investigate the influence of AVs on the passivation and corrosion properties of the steel, two same working electrodes were connected to the two poles of the ac generator and different amplitudes of AVs with the same frequency were superimposed to the prepolarised and the non-prepolarised steels. Different amplitudes of alternating voltages were superimposed to the pre- and non-prepolarised steels. The results demonstrated that passivation of the non-prepolarised steel was enhanced by low amplitude alternating voltages but was destroyed by high amplitude alternating voltages. Moreover, the corrosion of the prepolarised steel was worsened with the application of alternating voltages.


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    Title :

    Influence of alternating voltages on passivation and corrosion properties of X80 pipeline steel in high pH 0.5 mol L-¹ NaHCO3 + 0.25 mol L-¹ Na2CO3 solution


    Additional title:

    Einfluss von Wechselspannungen auf die Passivierung und Korrosionseigenschaften vom Rohrstahl X80 bei hohem pH-Wert und Lösungen von 0,5 mol l-¹ NaHCO3 und 0,25 mol l-¹ Na2CO3


    Contributors:
    Cui, Z.Y. (author) / Wang, L.W. (author) / Liu, Z.Y. (author) / Du, C.W. (author) / Li, X.G. (author)

    Published in:

    Publication date :

    2015


    Size :

    8 Seiten, 13 Bilder, 3 Tabellen, 22 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English