EFFECT OF NaOH CONCENTRATION AND AlO_2~- SPECIES ON CAUSTIC STRESS CORROSION CRACKING OF A LOW ALLOY STEEL AT 260℃

Acta Metall Sin

1997, Vol. 33

Issue (2): 143-149 DOI:

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EFFECT OF NaOH CONCENTRATION AND AlO_2~- SPECIES ON CAUSTIC STRESS CORROSION CRACKING OF A LOW ALLOY STEEL AT 260℃

LIU Su'e; ZHU Ziyong; KE Wei (State Key Laboratory for Corrosion and Metals;Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences;Shenyang 110015)

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LIU Su'e; ZHU Ziyong; KE Wei (State Key Laboratory for Corrosion and Metals;Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences;Shenyang 110015). EFFECT OF NaOH CONCENTRATION AND AlO_2~- SPECIES ON CAUSTIC STRESS CORROSION CRACKING OF A LOW ALLOY STEEL AT 260℃. Acta Metall Sin, 1997, 33(2): 143-149.

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Abstract The effects of NaOH concentration and AlO2 species on caustic stress corrosion cracking (SCC) for steel 16MnR at 260℃ were studied by using the sl0w strain ratetechnique (SSRT), cyclic voltammetry technique, and X-ray diffraction analysis. The results indicate that OH- promotes and AlO2 inhibits the caustic SCC susceptibility. The presence of aluminate anions (AlO2) in caustic solusions also makes the corrosion film more stable and protective and the repassivasion rate more rapid, leading to a less crack propagation. The X-ray diffraction analysis indicated that the film for simple caustic solution was Fe3O4 and for the aluminate solution was Fe3-xAlxO4(x≤2) and a littIe (Fe, Mn)3-x AlxO4(x≤2), which was not an amorphous film.

Key words: low alloy steel caustic SCC at high temperature AlO_2~-

Received: 18 February 1997

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