Intermittent immersion corrosion test method and device based on slow tensile stress corrosion testing machine

Abstract

The invention relates to the technical field of material corrosion testing and discloses an intermittent immersion corrosion test method and intermittent immersion device based on a slow tensile stress corrosion testing machine. A tensile section of a sample is fixed to the intermittent immersion device, the two ends of the sample are fixed to a connection rod (12) and a base (13) of the slow tensile stress corrosion testing machine respectively, corrosion media can soak the sample in the corrosion box (1) at intervals through a corrosion box (1), a pump (3) and a liquid inlet hole (6) and a liquid outlet hole (7) in the corrosion box (1), slow tensile stress corrosion testing is combined with intermittent immersion testing, and stress corrosion resistance of a metal material in the tidal and splash zone environment can be evaluated more scientifically. The method has the advantages of being high in operability, low in reformation cost, high in practicality and the like, and can adapt to different types of slow tensile stress corrosion testing machines, round bar samples, rectangular samples and samples in other forms. The testing device is simple in structure and convenient to disassemble and assemble, and normal use of the slow tensile stress corrosion testing machine is not affected.

Description

technical field [0001] The invention relates to the technical field of material corrosion testing, in particular to an interleaving corrosion testing method based on a slow tensile stress corrosion testing machine and an interleaving device. Background technique [0002] Stress corrosion refers to the corrosion damage of metals caused by the combined action of tensile stress and corrosive environment. It is a kind of brittle fracture with high risk. The slow tensile stress corrosion test is an effective test method to characterize the stress corrosion resistance of materials. This method can quickly evaluate the stress corrosion performance of materials, and the test cycle is short. It has been widely used in material evaluation and quality assurance testing. [0003] Due to the tidal phenomenon of the ocean, the superstructure area of ​​the ship and the offshore platform present two different working states: submerged in seawater and exposed to the air. This alternating fe...

AI Technical Summary

Problems solved by technology

In the existing immersion corrosion testing machine, the tested sample is in a non-stressed state, and the corrosion rate is calculated by the weight loss method, which cannot characterize the stress corrosion sensitivity of the material

In the existing slow tensile stress corrosion testing machine, the sample is in the state of full immersion environment, which cannot simulate the inter-immersion environment in the tidal range area under the actual service state.

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