Device and method for evaluating corrosion state of metal part under simulated ocean multi-parameter condition

Abstract

The invention discloses a device and method for evaluating the corrosion state of a metal part under the simulated ocean multi-parameter condition, and the device comprises an inner reservoir and an outer reservoir, the inner reservoir is installed in the middle of the interior of the outer reservoir in a nested manner, and the inner reservoir and the outer reservoir can form a circulating ecological seawater flow. The technical problem that a marine corrosion experiment cannot be carried out when a laboratory does not have a marine environment is solved, the evaluation method uses a monitoring method based on an image processing method to measure the corrosion rate, the obtained image is identified by using an Otsu method and region growth, and the corrosion region area is obtained according to the total number of pixels of the image. The corrosion area change value corresponds to the corrosion rate measured by a linear polarization method, and the corrosion rate is rapidly determined through real-time image monitoring. The comprehensive influence of the actual marine environment on material corrosion is fully considered, and the device has the advantages of real experimental data, short test period, high efficiency, simple structure and convenience in use.

Description

technical field [0001] The invention relates to the field of marine corrosion experiments, in particular to a device and method for evaluating metal corrosion states under simulated marine multi-parameter conditions. Background technique [0002] The ocean occupies more than 2 / 3 of the earth's surface and contains extremely rich mineral resources. With the rise of emerging marine industries such as maritime transportation, deep-sea mining, port terminals, oil and gas development, and marine biotechnology, human beings have gradually deepened the development and utilization of the ocean, and the scale of ocean development has also continued to expand. However, the marine environment is a highly corrosive disaster environment, and various materials are prone to corrosion, deterioration and damage in the marine environment. The loss caused by corrosion includes two categories: direct loss and indirect loss. It is a kind of damage that is quietly going on. The direct economic l...

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Problems solved by technology

However, the coupon method requires weight loss calculation and analysis after the experiment is completed to obtain the corrosion rate, which is not only time-consuming but also has a large error in the experimental results.

The disadvantage of the electrochemical method is that the sample processing requirements are strict, because the sensitivity is related to the cross-section of the sample.

The thinner and thinner the sample, the higher the sensitivity. It takes a long time to measure the low corrosion rate system, and the local corrosion characteristics cannot be measured. If it is used for non-uniform corrosion, there is also a large error, and the measured corrosion rate varies with the change. Deviates from the uniform degree of aggravation

Although the electrochemical noise technology has a simple measurement device, does not require external disturbances, and has no interference with the measured system, it can be analyzed by mathematical methods to reflect the real situation of material corrosion. The relationship between the signal and the corrosion of metal electrodes has not yet established a complete test system, so it is not conducive to the monitoring and research of metal corrosion

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