CREVICE CORROSION OF STAINLESSSTEEL IN NaCl SOLUTION-CHANGES OF ANOLYTE AND STATE OF Cr(Ⅲ) EXISTING WITHIN CREVICE

J Chin Soc Corr Pro

1985, Vol. 5

Issue (1): 9-17 DOI:

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CREVICE CORROSION OF STAINLESSSTEEL IN NaCl SOLUTION-CHANGES OF ANOLYTE AND STATE OF Cr(Ⅲ) EXISTING WITHIN CREVICE

Lin Yuzhen (Beijing Institute of Chemical Technology;Beijing;China)

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Abstract A simulated crevice corrosion cell was used to study the anolyte within crevice of Steel Cr18Ni9Ti in 3% NaCl sulotion.As the anodic current increased the pH value decreased rapidly and the alloying element Cr was the main factor for the lowering of pH value of anolyte within crevice.It was found that the Cr(Ⅲ)existed in the form of stable soluble hydroxy-chloro-complexes in the occluded solution within crevice.The insoluble hydroxide Cr(OH)_3 precipitate was not observed.It was deduced that the passive film on the surface of the stainless steel within crevice was destroyed by the formation of hydroxy-chloro- complexes through a process of characteristic adsorption of Cl~- ions onto the passive film and then combination with Cr,which was the main component in the passive film.Thus corrosion inside crevice was accelerated.

Received: 25 February 1985

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Lin Yuzhen (Beijing Institute of Chemical Technology;Beijing;China). CREVICE CORROSION OF STAINLESSSTEEL IN NaCl SOLUTION-CHANGES OF ANOLYTE AND STATE OF Cr(Ⅲ) EXISTING WITHIN CREVICE. J Chin Soc Corr Pro, 1985, 5(1): 9-17.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1985/V5/I1/9

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