Intermittent immersion corrosion test method for natural sea water simulation accelerated material corrosion

Abstract

An alternating immersion corrosion testing method for simulating the acceleration of material corrosion by natural seawater includes six parts: alternating immersion corrosion test conditions, pre-test test plate treatment, alternating immersion corrosion test, post-test sample treatment, alternating immersion corrosion rate calculation, comparison between corrosion rates in the same tidal range zone, and test report. With the natural seawater taken as an immersion medium, the large test plate alternating immersion test can be conducted. The test plate is subjected to a cyclic test in the order of firstly being immersed in the seawater, secondly being exposed to the air, and finally be immersed in the seawater. The testing method simulates and studies the law of material corroding in the tidal range zone, and evaluates the corrosion resistance and the aging resistance of the material as well as the protection effect of the protective material, thereby providing a significant technical support for designing, testing and evaluating the adaptability of the material to the marine environment, shortening the period for developing novel materials, projecting the applicable performance of novel materials in environment, increasing the success rate in developing novel materials as well as products and components thereof, and reducing the development cost.

Description

technical field [0001] The invention belongs to the technical field of material corrosion, and in particular relates to an interleaving corrosion test method for simulating accelerated material corrosion in natural seawater. Background technique [0002] The seawater tidal range test in the natural environment is a commonly used test method to study seawater corrosion. It can truly reflect the corrosion status of the material in the alternating dry and wet conditions at the location, so as to calculate the corrosion rate of the material under this environmental condition. It can provide reasonable and reliable design basis for anti-corrosion design. However, due to the long test period in the tidal range area and the strong regionality of the test, people are prompted to carry out simulated accelerated corrosion test research in order to speculate on the results of the outdoor long-term tidal range corrosion test from the indoor accelerated corrosion test, and then predict t...

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Problems solved by technology

The interleaving corrosion testing machine developed by the 725 Institute mentioned in the literature and the intermittent immersion test introduced in GB / T16168-96, the interleaving tests are indoor simulation acceleration, the medium used is artificial seawater, and the volume of the test facility is small. Can only carry out infiltration test research on test panels with a size smaller than 120mm×50mm, and can not carry out infiltration tests on large test panels, and the research results show that there is no obvious correspondence between the laboratory infiltration test results and the actual exposure to the marine environment

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