Corrosion current online detection method based on gas corrosivity detection battery

Abstract

The invention relates to a corrosion current online detection method based on a gas corrosivity detection battery. The method includes the steps that a 200-mV reference voltage is supplied to the porous thin plate type gas corrosivity detection battery, so that the gas corrosivity detection battery generates corrosion currents, and then a corrosion current detection device collects the corrosion currents and reads corrosion current values; the collected currents are processed through the I-V conversion technology, cumulative calculation is conducted on corrosion current average values in the measuring process; measuring errors of a detecting instrument are corrected through a straight line fitting method according to the obtained corrosion current average values, so that the corrosion current values are accurately and stably detected. Compared with an existing corrosion current detection method, the corrosion current online detection method based on the gas corrosivity detection battery has the advantages that the method is higher in real-time performance and practical value, can be used for long-time online detection of the corrosion currents of the battery and enable the corrosion currents to have higher real-time performance, can also achieve additional functions of the corrosion currents in the online detection field, such as setting of a threshold value, manufacturing error correction of the battery, online data storage and other intelligent functions, and is applicable to more detection and application occasions of the corrosion currents.

Description

technical field [0001] The invention relates to a detection technology, in particular to an online detection method for corrosion current of a gas corrosion detection battery. Background technique [0002] Offshore oil production platform equipment and various metal materials are in the highly corrosive marine atmosphere all year round and suffer severe corrosion. According to the feedback from the production department, the service life of the same material on the platform is several to dozens of times shorter than that on land. In order to provide a basis for formulating anti-atmospheric corrosion measures, it is necessary to study the influence of the atmosphere (relative humidity, temperature and salt deposition) on the corrosion of carbon steel. [0003] There are two main fast methods for measuring the corrosion rate of metals in a gas environment: 1. Resistance probes, which use the resistance change after metal corrosion to reflect the corrosion status, have poor da...

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Problems solved by technology

[0006] At present, there are almost no detection methods and instruments for the porous thin plate corrosion detection battery that need to realize the above multi-functionality. Considering the commercial value and its application field, an online corrosion current detection method based on the porous thin plate gas corrosion detection battery is proposed. How? The difficulty of this method is to use low-cost electronic components to achieve high-precision measurement of corrosion current with multiple functions and the stability of online detection.

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