Detecting and dosing device and method for pre-removing oxygen in solution for corrosion test

Abstract

The invention discloses a detecting and dosing device and method for pre-removing oxygen in a solution for corrosion test. The detecting and dosing device comprises an oxygen pre-removing and liquid pouring system, a dissolved-oxygen detection system, a corrosion-test container, a dosing system, a high-purity nitrogen bottle and a tail-gas collecting container. The detecting and dosing device andmethod disclosed by the invention have the beneficial effects that the device and the method are used for completely pre-removing the oxygen in the test solution, and monitoring whether the content ofthe dissolved oxygen in the solution meets the test requirements, meanwhile after a pipeline is connected once in place till completion of oxygen pre-removal, the test solution is led into a test device to carry out corrosion test, the disassembling work of the pipeline is not needed, so that the problems of mixing of the dissolved oxygen, easy volatilization of a corrosion inhibitor and the likein a switching process of oxygen pre-removal and liquid pouring are avoided, and the conduction of the corrosion test in a completely-controllable no-oxygen environment is ensured from all aspects.

Description

technical field [0001] The invention relates to the field of material corrosion testing, in particular to a solution pre-deoxygenation detection and dosing device and method for corrosion testing, which is suitable for corrosion tests under simulated working conditions with strict requirements on the dissolved oxygen content in the test solution, and is especially suitable for realizing Oxygen-free environment (dissolved oxygen content is ppb trace level) in oil, natural gas and other collection and transportation pipelines, and can be used to evaluate the corrosion inhibition efficiency of volatile gas phase corrosion inhibitors on pipes. Background technique [0002] In order to study the corrosion behavior and law of materials in their environment and evaluate the corrosion inhibition effect of corrosion inhibitors, it is necessary to evaluate the corrosion resistance of materials under simulated field conditions and environmental conditions. In the oil and natural gas in...

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the early contact between the sample and the corrosion solution containing dissolved oxygen, the dissolved oxygen has a great influence on the corrosion test results

Can not fully simulate the actual anaerobic conditions

[0006] (2) It is impossible to detect and determine whether the dissolved oxygen content in water meets the test requirements. It can only be judged by personal experience, and the repeatability of the test operation is poor.

[0007] (3) For highly volatile gas-phase corrosion inhibitors, in the process of deoxidizing the corrosion solution, the volatile components in the gas-phase corrosion inhibitors that have been added to the kettle are bound to be removed, which affects the evaluation results of corrosion inhibition efficiency. accuracy

Therefore, it is impossible to ensure that the test solution is completely deoxygenated, and at the same time, it is impossible to monitor the dissolved oxygen content in the test solution in real time to ensure that the dissolved oxygen content reaches the ppb level

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