Evaluation method for stable rust layer of weathering bridge steel in high salinity marine atmospheric environment

Abstract

The invention discloses a method for evaluating a stable rust layer of a weather-resistant bridge steel in a high-salt ocean atmosphere environment. The method comprises the following steps: 1) sampling for standby; 2) performing a weekly immersion corrosion test on several groups of samples of the weather-resistant bridge steel rust layer; 3) Measure the capacitance value C of the weather-resistant bridge steel rust layer sample before the immersion corrosion test 0 and the capacitance value C after the test t ; 4) calculate the rust layer absorption rate α; 5) get the same weather-resistant bridge steel rust layer sample after the test to make a thin slice and put it into the potential test device, and measure the potential difference E when the different solution concentration ratio x is measured with a potentiometer; 6) Plot the test results with E x to obtain the slope of the curve as the resistance factor β of the weather-resistant bridge steel rust layer sample to the corrosive ions in the marine environment; 7) Calculate the evaluation value K, and evaluate the weather-resistant bridge steel according to the K value Corrosion resistance of rust samples. The method of the invention can effectively evaluate the corrosion resistance performance of the weather-resistant bridge steel in the high-salt ocean atmosphere environment, and has short test period and simple operation.

Description

Evaluation method for stable rust layer of weathering bridge steel in high salinity marine atmosphere technical field The present invention relates to the technical field of weathering bridge steel stable rust layer, be specifically related to a kind of high salinity marine atmosphere environment Evaluation method for stable rust layer of medium weathering bridge steel. Background technique Bridge steel is exposed to the natural environment for a long time, and different degrees of corrosion will cause different degrees of corrosion to steel structural parts. corrosion damage, thereby affecting its safety, reliability and durability. In the atmosphere, the rust layer formed on the surface of carbon steel is loose, with a large amount of Micro-cracks and voids, it can not play a good protective effect. On the other hand, the surface of weathering steel will form a dense rust layer, which can prevent corrosion When the medium enters, the atmospheric corrosion resista...

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Problems solved by technology

[0004] At present, the evaluation methods for evaluating the stability of weather-resistant bridge steel rust layer mainly include visual inspection method, tape adhesion test method, and weekly immersion corrosion test method. These methods are used to evaluate the surface properties of weather-resistant bridge steel rust layer, and the calculated corrosion rate is more The corrosion rate of the matrix with many reactions, for different corrosion environments, especially the marine environment, cannot directly judge the protection ability against Cl- and evaluate the excellent corrosion resistance of the rust layer

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