Method for testing seawater corrosion of low-alloy steel under stress state

Abstract

The invention relates to a method for testing seawater corrosion of low-alloy steel under a stress state. The method comprises two steps: 1, loading a constant strain by adopting four-point bending, bending a sample by a spiral micrometer setting bolt, and measuring a flexibility; and 2, installing a plurality of constant-strain loading devices on a real sea sample charging frame with a slot, and installing a multichannel potential acquiring device, and performing potential monitoring in a natural seawater or deep sea environment. The method for testing the seawater corrosion of the low-alloy steel under the stress state, provided by the invention, is capable of realizing evaluation of stress corrosion performance of a stress member under a natural environment, and can be applied to research of a material stress corrosion mechanism in a laboratory. The invention provides a novel testing method for the research of the stress corrosion performance of a stress structure in a service working condition; by adopting test data obtained by the method, the corrosion rule of the material and the member under the working condition can be actually reflected, and a favorable corrosion research means is provided for the research of a use material in the working condition.

Description

technical field [0001] The invention relates to a seawater corrosion test method for low-alloy steel under a stress state, belonging to the field of metal material corrosion test methods. Background technique [0002] Low-alloy steel has high strength, good toughness and excellent welding performance, and is widely used in ships and ship-borne equipment, coastal buildings, docks and offshore platforms and other structures. High salinity, high humidity, and heavily polluted marine environment make corrosion an important factor affecting and restricting the safe use of ships and marine engineering equipment. A common form of corrosion in low alloy steel is generalized corrosion, but ships and marine engineering structures are generally not subject to failure due to generalized corrosion. Due to the complexity of service conditions, local corrosion such as ulcers and pitting corrosion often occurs in low-alloy steel structures. The most dangerous form of damage is stress corro...

AI Technical Summary

Problems solved by technology

However, the stress corrosion test devices described in the above-mentioned patented technologies cannot be used for seawater natural environment tests.

So far, in the field of metal material corrosion test methods, no test methods for metal material corrosion in natural seawater environment under stress state have been found, and there are no identical or similar technical records or literature reports.

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