Method for testing carbon dioxide corrosion resistance of low-Cr pipeline steel
A carbon dioxide and inspection method technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problem of not establishing the inspection method for the corrosion performance of low Cr pipeline steel, and achieve convenient solution preparation and simple results. Effect
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example 1
[0025] Example 1: 3 low-Cr pipeline steel samples from Batch 1# were obtained by machining as parallel samples of low-Cr pipeline steel. The measured dimensions of the three samples were 40.01mm×9.98mm×4.01mm, 40.00mm×9.99mm×4.01 mm, 40.01mm×9.98mm×4.02mm (length×width×height), weighing 12.5514g, 12.4702g, 12.5783g respectively. Weigh 25gNaCl and 2.5gCH 3 COOH was dissolved in 4972.5g deionized water to make corrosion solution, and 5Kg corrosion solution was prepared, and the measured pH value was 2.61. Fix the three samples on the rotating sample holder, put them into a closed reaction kettle, add the corrosion solution, and pass through the CO 2 gas. Control the temperature of the reactor to 80°C, CO 2 The partial pressure is 1.5MPa, CO 2 The flow velocity is 2m / s. Start timing, end the test after 720 hours, and take out the sample. Put 3 samples into 50%HCl+0.5%C at 60℃ 6 h 12 N 4 Soak in pickling solution for 1 hour, take out the sample, rinse it with deionized wa...
example 2
[0026] Example 2: Three samples of low-Cr pipeline steel from Batch 2# were obtained by machining as parallel samples of low-Cr pipeline steel. The measured dimensions of the three samples were 39.86mm×9.98mm×4.12mm, 39.87mm×9.99mm×4.11 mm, 39.98mm×10.01mm×4.12mm, weighing 12.7827g, 12.8655g, 12.8153g respectively. Weigh 25gNaCl and 2.5gCH 3 COOH was dissolved in 4972.5g deionized water to prepare a corrosion solution. A total of 5Kg corrosion solution was prepared, and the measured pH value was 2.6. Fix the three samples on the rotating sample holder, put them into a closed reaction kettle, add the corrosion solution, and pass through the CO 2 gas. Control the temperature of the reactor at 80°C, CO 2 The partial pressure is 1.5MPa, CO 2 The flow velocity is 2m / s. Start timing, end the test after 720 hours, and take out the sample. Put the sample into 50%HCl+0.5%C at 60℃ 6 h 12 N 4 Soak in pickling solution for 1 hour, take out the sample, rinse it with deionized wate...
example 3
[0027] Example 3: Three low-Cr pipeline steel samples of batch 3# were obtained by machining as parallel samples of low-Cr pipeline steel. The measured dimensions of the three samples were 40.01mm×10.02mm×4.01mm, 40.00mm×9.99mm×4.00 mm, 40.01mm×9.99mm×4.01mm, weighing 12.5013g, 12.1583g, 12.5836g respectively. Weigh 25gNaCl and 2.5gCH 3 COOH was dissolved in 4972.5g deionized water to prepare a corrosion solution. A total of 5Kg corrosion solution was prepared, and the measured pH value was 2.59. Fix the 3 samples on the rotating sample rack, put them into a closed reaction kettle, add the corrosion solution, and pass in CO 2 gas. Control the temperature of the reactor at 80°C, CO 2 The partial pressure is 1.5MPa, CO 2 The flow velocity is 2m / s. Start timing, end the test after 720 hours, and take out the sample. Put the sample into 50%HCl+0.5%C at 60℃ 6 h 12 N 4Soak in pickling solution for 1 hour, take out the sample, rinse it with deionized water and absolute ethan...
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