#TITLE_ALTERNATIVE#
Based on the experiments done by the previous workers, it is know that sensitized AISI 304 stainless steel is susceptible to SCC in the solution of NaCl 297,2 gpl; at 85 degrees C. In this experiments, immersion tests have been conducted continuously for 2 weeks under constant load, using sensitized...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/11809 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Based on the experiments done by the previous workers, it is know that sensitized AISI 304 stainless steel is susceptible to SCC in the solution of NaCl 297,2 gpl; at 85 degrees C. In this experiments, immersion tests have been conducted continuously for 2 weeks under constant load, using sensitized specimens at 650 degrees C for 6, 12, and 24 hours. In the 297,2 gpl NaCl solution without inhibitor; SCC failures occurred on all sensitized specimens after: 5, 4, and 3 days of immersion respectively after sensitization for 6, 12, and 24, hours.<p> <br />
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Mixed chromate and phosphate, which is used as corrosion inhibitor for iron, expected to be able to protect the chromium-depleted adjacent the grain boundary against intergranular corrosion, and SCC attack. Adequate concentration of mixed inhibitor chromate and phosphate, (1+1) gpl and (10+10) gpl, had successfully inhibit SCC on sensitized stainless steel AISI 304. In the other side, mixed inhibitor chromate and phosphate with concentration of (0,05+0,05) gpl and (0,1+0,1) gpl have been found to be inadequate, so that the SCC failure had occurred on 12 hours sensitized specimens with time to failure: 9 days for mixed inhibitor with concentration of (0,05+0,05) gpl, and 10 days concentration of (0,1+0,1) gpl.<p> <br />
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Intergranular corrosion which forms on the specimens surface had initiating crack along the grain boundary, if stress intensity on the crack tip exceeds its treshold value. Carbide precipitation along the grain boundary of sensitized stainless steel AISI 304 had introduce the stress perpendicular to grain boundary, which caused the reduction of applied stress required to exceed its treshold value, so that the crack propagation would be easier to occur. On the other hand, sensitization reduced the yield strength and ductility of stainless steel AISI 304, although it has increased its ultimate tensile stress. |
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