A testing loop for Erosion-Corrosion at high temperature and high velocity was designed and established, and the Erosion-Corrosion experiment of Cr5Mo was carried out under the condition of 230-248 ℃, 47m/s, total acid number 8.3 mgKOH/g oil. The results indicated that under the Erosion-Corrosion condition the weight loss of the sample increased and the weight loss rate of the sample reached a certain value with time; under the Quiescent-Corrosion condition, th weight loss of the sample came to a certain value and the weight loss rate of the sample decreased with time; the data obtained from the experiment were consistent with those from the field.
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