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J Chin Soc Corr Pro  1998, Vol. 18 Issue (1): 7-13    DOI:
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CAUSTIC STRESS CORROSION CRACKING OF ALLOY 800 PART Ⅱ. THE EFFECT OF THIOSULFATE
KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De-lun ZHANG Yun-ke CHEN Sheng-hao(Shanghai Research Institute of Materials; Shanghai 200437) (Dept. of Chemistry; Shandong University; Jinan 250100)
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Abstract  The effect of additon of Na2S2O3 to boiling solution of 50%NaOH+0.3%SiO2 on SCC of Alloy 800 was investigated using C-ring tests along with anodic polarization measurements for Alloy 800, pure Cr, Ni and Fe. Na2S2O3 was found to stimulate the anodic dissolution and retard the passivation of Alloy 800. This was mainly attributed to the effect of S2O32- on the anodic polarization behavior of Ni. Addition of S2O32- gave rise to acceleration of caustic SCC of Alloy 800, and the maximum cracking rate was observed at ca. -40 mV (SCE).
Key words:  Alloy 800      Caustic SCC      C-ring test      Thiosulfate      Anodic dissolution     
Received:  25 February 1998     
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KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De-lun ZHANG Yun-ke CHEN Sheng-hao(Shanghai Research Institute of Materials; Shanghai 200437) (Dept. of Chemistry; Shandong University; Jinan 250100). CAUSTIC STRESS CORROSION CRACKING OF ALLOY 800 PART Ⅱ. THE EFFECT OF THIOSULFATE. J Chin Soc Corr Pro, 1998, 18(1): 7-13.

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