Marine splash corrosion testing apparatus and method for simulating and measuring splash corrosion

Abstract

The invention discloses a marine splash corrosion testing apparatus and a method for simulating and measuring splash corrosion. The testing apparatus comprises a testing chamber, a transmission shaft, a specimen holder, a solution tank and a solution conveying mechanism. The transmission shaft is horizontally arranged inside the testing chamber and is driven by a driving mechanism to rotate. The transmission shaft is provided with multiple agitating vanes. The specimen holder is fixed on the sidewall of the testing chamber. The specimen holder is equipped with a specimen clamp used for installing a specimen. The solution conveying mechanism is connected between the solution tank and the testing chamber through a conveying pipeline, and is used for conveying a test solution. The apparatus and the method are convenient for accurate simulation of splash corrosion.

Description

technical field [0001] The invention relates to the field of measurement of steel splash corrosion, in particular to a marine splash corrosion test device and a method for simulating and measuring splash corrosion to simulate and measure steel splash corrosion. Background technique [0002] Corrosion is a major failure mode of steel materials. In the development of marine resources, steel is widely used in large marine components such as marine power generation equipment, cross-sea bridges, submarine pipelines, offshore platforms, and ships. Such components face more serious corrosion problems during service due to the presence of high concentrations of chloride ions in the ocean and atmosphere. The corrosion of steel in the marine environment can be divided into five areas from top to bottom: marine atmospheric corrosion, seawater splash zone corrosion, tidal zone corrosion, seawater full immersion zone corrosion, and sea mud corrosion. Among them, the splash zone is in a...

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Problems solved by technology

Such tests usually have a long period, high cost, and are easily disturbed by bad weather, which is not conducive to the development of seawater corrosion-resistant steel and the guidance of material selection for related components

[0006] Due to the complex corrosion conditions in the seawater splash zone, there is still a lack of test equipment for simulating corrosion in the splash zone in the laboratory.

The patent "Seawater Splash Corrosion Test Apparatus for Weathering Steel" (ZL200620034876.9) published in 2007 simulates the corrosion in the seawater splash zone by spraying simulated seawater on the sample regularly through the nozzle. The condition is not uniform, and the impact of the nozzle is difficult to simulate the scouring effect of waves on components, which is not enough to truly reflect the corrosion of components in the seawater splash area; the patent published in 2008 "An adjustable speed test device that can be used for seawater interleaving corrosion "(CN201141826Y) and the patents published in 2015 "A dry-wet cycle simulation accelerated coating corrosion experimental device in seawater environment" (CN204128939U), "Seawater corrosion simulation device" (CN104330351A) use simulated seawater to evaluate the performance of materials in the laboratory Seawater corrosion performance

[0009] From the comparison with the existing literature and patents, it can be found that although there are many patented technologies or test devices related to corrosion in the ocean splash zone, the corrosion test in the live sea area has the problems of long cycle, high cost and easy operation interference, while the test The simulation device in the laboratory has a single test environment, only alternating wet and dry without seawater washing, so it is difficult to truly simulate the complex corrosion conditions in the splash zone

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