Method for evaluating corrosion resistance of welded steel and application thereof

Abstract

The invention relates to a method for evaluating the corrosion resistance of welded steel and an application thereof, and provides a method for evaluating the corrosion resistance of materials in allregions after welding by utilizing an electrochemical polarization curve so as to solve the problem that the corrosion resistance of weather-proof bridge steel after welding is difficult to measure. The method specifically comprises the steps: respectively sampling a welded base metal, a weld metal and a heat affected zone, measuring open-circuit potentials and polarization curves of all samples in a simulated industrial atmospheric environment, and evaluating the corrosion resistance of the material according to the self-corrosion potentials of the tested samples. The method can be applied todetermination of the corrosion resistance of the weather-resistant bridge steel, has the advantages of simplicity and convenience in operation and quickness and accuracy in analysis, and can be usedfor evaluating the corrosion resistance of all post-welding materials.

Description

technical field [0001] The invention relates to a method for evaluating the corrosion resistance of welded steel. Background technique [0002] The demand for steel for bridges has also increased rapidly. The construction of bridges has changed from the original rivet connection to the current welding. High-performance bridge steel requires not only high strength, good toughness and welding performance, but also good weather resistance / atmospheric resistance. corrosion performance. [0003] At present, the detection methods for the corrosion resistance of metal materials include the immersion method, the salt spray method, the atmospheric exposure method, and the electrochemical test method. In addition to the electrochemical test method, several other test methods need to consume a lot of time. The actual identification efficiency of materials has been greatly reduced. For example, the patent "A Test Method for Simulating the Corrosion of Steel Bars in Industrial Atmospher...

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Problems solved by technology

[0003] At present, the detection methods for the corrosion resistance of metal materials include the immersion method, the salt spray method, the atmospheric exposure method, and the electrochemical test method. In addition to the electrochemical test method, several other test methods need to consume a lot of time. The actual identification efficiency of materials has been greatly reduced. For example, the patent "A Test Method for Simulating the Corrosion of Steel Bars in Industrial Atmospheric Environment" (publication number CN 103454207A) uses the weekly immersion method, which is cumbersome to operate and the cycle is too long; while the patent " A method for measuring the corrosion performance of materials" (publication number CN 102749280A) adopts the atmospheric exposure method, and the sample is subjected to tensile strain pretreatment before the test. Although the test period is shortened, the sample specification is strict, and it is also not suitable for the resistance of the welded material. Determination of corrosion performance

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