Stress corrosion cracking of type 321 stainless steels in simulated petrochemical process environments containing hydrogen sulfide and chloride

被引:49
作者
Chen, YY [1 ]
Liou, YM [1 ]
Shih, HC [1 ]
机构
[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 407卷 / 1-2期
关键词
stress corrosion cracking; type 321 stainless steel; slow strain rate test; U-bend immersion test; sodium chloride; sodium thiosulfate; factorial experiments; Yates's algorithm;
D O I
10.1016/j.msea.2005.07.011
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The susceptibility to stress corrosion cracking (SCC) of type 321 stainless steel (type 321 s) in a simulated petrochemical process environment containing hydrogen sulfide and chloride (20 wt.% NaCl + 0.01 M Na2S2O3, pH 2) was assessed using the slow strain rate tensile (SSRT) test and static load (U-bend) tests at the free corrosion potentials. In the SSRT, effects of environmental factors, such as chloride (Cl-) plus thiosulfate (S2O32-), Cl- concentration, solution pH, and temperature, on the susceptibility to SCC of type 32 Is were critically examined. In addition, factorial design experiments using Yates's algorithm quantitatively estimated the individual and interactive effects of temperature, Cl- concentration, and solution pH on the SCC susceptibility of type 321 s. In the U-bend tests, specimens were immersed in an autoclave containing deaerated 20 wt.% NaCl + 0.01 M Na2S2O3 aqueous solution (pH 2) for 1400 h at either 80 or 300 degrees C. Results of the SSRT tests indicated that the effects of environmental factors on the SCC susceptibility of type 321 s decreased in the following order: temperature effect >> solution pH effect > Cl- concentration effect. The mechanism of SCC induced by corrosion pits or TiC particles (5-10 mu m) is discussed. In addition, results of the U-bend tests show that the susceptibility of type 321s to SCC decreases with increasing temperature, which is related to the more compact surface film containing chromic oxide (Cr2O3) and magnetite (Fe3O4) that forms at the higher temperatures. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:114 / 126
页数:13
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