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快速劃傷法研究裸露金屬的點蝕熱力學

Thermodynamics of Pitting Corrosion on the Bare Metal Surface by the Rapid Scratch Technique

  • 摘要: 采用快速劃傷法對18-8Ti、316L不銹鋼和Incoloy800合金在氯化鈉溶液中的裸表面臨界點蝕電位Ec進行了精確的測量。分析了金屬裸表面上點蝕的形成機理,指出了裸表面臨界點蝕電位的物理意義。研究表明,Ec與氯離子濃度成半對數關系。比較并分析了Ec與動電位法測得的點蝕擊破電位Eb、保護電位Ep之間的關系。研究表明,EcEb在不同pH值的氯化鈉溶液中表現出相同的變化規律,并通過測得再鈍化系數的變化規律來說明pH值對EcEb的影響。

     

    Abstract: The pitting corrosion of austenite stainless steels and alloy 800 in sodium chloride aqueours has been studied by the rapid scratch technique. The critical potential of the bare metal surface (Ec) obtained by the rapid scratch technique is an accurate potential value. The mechanism of pitting corrosion on the bare metal surface has been discussed and the physical sense of Ec has been proposed. Ec changes linearly with the logarithm of chlorion concentration. Ec is compared with breakdown potential (Eb) and protection (Ep) obtained by potentiodynamic technique. Ec and Eb change in the same way within a large pH range. In order to explain it, the coefficients of repassivation are measured.

     

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