Materials Performance Supplements

CORTEC 2019

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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It is noted in Table 2 that Sample No. 1 and Sample No. 4 are the most representative for recommended applications. The con- trol sample analyzed was found to have no organic nitrogen content, as expected. Immersion Corrosion Testing Based on the results of the extraction testing, the following concentrations were selected to evaluate the effectiveness of the partitioned corrosion inhibitor in solu- tion. Samples were prepared as described in Table 2 and labeled as shown in Table 3. First Iteration of Test Immersion testing was conducted for 479 h to assess the level of corrosion protec- tion provided at various concentrations. As shown in Table 4, increasing inhibitor con- centration in general showed improved cor- rosion protection. Corrosion rate reduction was above 75% for most samples. While it would be expected to see the corrosion rate in Sample E be higher than that of Sample D, this was not the case in the first iteration of immersion corrosion testing. Note that the mass loss from the panel cleaning procedure was determined to be negligible. Mass loss values represent the mass loss values measured during testing. To better explore the results, the sec- ond iteration of immersion corrosion test- ing was performed. Second Iteration of Test The second iteration of immersion cor- rosion testing was conducted for 435 h. As shown in Table 5, more careful sample preparation and cleaning, as well as eval- TABLE 4 Immersion Testing Results—First Iteration Sample Inhibitor (ppm) Starting Mass (g) Ending Mass (g) Mass Loss (mg) Corrosion Rate (mpy) Corrosion Reduction (%) Control — 31.923 31.835 87 1,432.7 — A 5,000 31.476 31.476 0 0.0 100 B 2,000 32.140 32.139 1 16.5 99 C 1,000 31.558 31.537 21 345.8 76 D 800 32.461 32.410 51 839.9 41 E 500 32.159 32.140 20 329.4 77 TABLE 5 Immersion Testing Results—Second Iteration Sample Sample No. Inhibitor (ppm) Starting Mass (g) Ending Mass (g) Mass Loss (A) (mg) Corrosion Rate (mpy) Control 1 — 32.298 32.207 89 1,613.9 2 32.394 32.313 78 1,414.4 3 32.316 32.246 68 1,233.1 A 1 5,000 32.235 32.233 0 — 2 32.090 32.087 0 — 3 32.378 32.376 0 — B 1 2,000 32.272 32.270 0 — 2 32.173 32.171 0 — 3 32.108 32.105 0 — C 1 1,000 32.014 32.012 0 — 2 31.889 31.887 0 — 3 31.969 31.967 0 — D 1 800 32.125 32.123 0 — 2 32.319 32.317 0 — 3 32.144 32.142 0 — E 1 500 32.094 32.084 7 126.9 2 32.153 32.150 0 — 3 32.280 32.278 0 — (A) Calculation includes the correction for mass lost during the panel cleaning procedure. Corrosion Protection in an Oil System with Water Ingress by Use of Volatile Corrosion Inhibitors 21 CORTEC SUPPLEMENT TO MP MATERIALS PERFORMANCE JUNE 2019

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