Method for testing influence on corrosion inhibition performance of corrosion inhibitor caused by pH value

Abstract

The invention discloses a method for testing influence on the corrosion inhibition performance of a corrosion inhibitor caused by a pH value. The method comprises the steps of forming test pieces through machining a petroleum pipe material for later use; putting the test pieces into a vessel, removing dirt on the surfaces of the test pieces, and continuously cleaning; polishing, and measuring and recording sizes; scrubbing and blowing the test pieces, drying the test pieces, weighing and recording data; hanging the test pieces in the corrosion inhibitor, adjusting the pH value of the corrosion inhibitor to 1.0-12.0, and carrying out corrosion reaction; flushing, soaking the test pieces in a rust remover, and cleaning; wiping, blowing and weighing; solving the corrosion rate and corrosion inhibiting rate of each group of test pieces according to initially-measured mass number and finally-measured mass number. The method has the advantages that the influence on the corrosion inhibition performance of the corrosion inhibitor caused by the pH value can be assayed quickly, the test results are accurate, the test steps are simple, the test cost is low, and a theoretical basis is provided for the application of the corrosion inhibitor.

Description

technical field [0001] The invention relates to a method for testing the corrosion inhibition performance of a corrosion inhibitor affected by pH value. Background technique [0002] At present, corrosion inhibitors and their derivatives are widely used in the fields of rubber, petroleum, agriculture, mining, medicine, environmental protection and analytical chemistry as oil removers, water purifiers, scale inhibitors, film formers and anti-pressure additives. . In the future, the application field of this kind of substance will be further expanded. [0003] In the petroleum industry, corrosion inhibitor compounds are mainly used as extreme pressure antiwear agents for lubricating oils and high temperature antioxidants. Because the phosphorus element in the dithiophosphate lubricating oil anti-wear additives commonly used now will poison the catalyst of the engine exhaust gas conversion device, and based on environmental protection considerations, all countries have strict...

AI Technical Summary

Problems solved by technology

Therefore, they are sometimes called anodic corrosion inhibitors or dangerous corrosion inhibitors, because once the dosage of them is insufficient (in the case of corrosion inhibition alone, the dosage required to treat 1L of water is often as high as hundreds or even thousands of milligrams) will cause point damage. Corrosion, so that the original less serious corrosion problems, but become more serious

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