Constant-load stress corrosion online observation test device in hydrofluoric acid environment

Abstract

The invention relates to a constant load stress corrosion online observation test device in a hydrofluoric acid environment, which is characterized in that an inner tank and an outer tank are respectively provided with a corrosion tank inner cover and a corrosion tank outer cover, two sides of the corrosion tank are respectively provided with a baffle plate, the corrosion tank inner cover is provided with a transparent observation window, and the transparent observation window is provided with an optical microscope; side holes are transversely formed in an inner tank and an outer tank of the corrosion tank in a penetrating manner, a sample is inserted into the side holes, a loading shaft with a fixing pin is vertically inserted into a round hole in the left end of the sample, the loading shaft is sleeved with a spring, and a nut is installed at the end of the loading shaft in a threaded manner; the right end of the sample is fixed with the baffle; an inlet hole is formed in an inner tank of the corrosion tank, an outlet hole is formed in an outer tank of the corrosion tank, and the inlet hole and the outlet hole are jointly connected to a circulating pump through a circulating liquid inlet pipe and a circulating liquid outlet pipe respectively. The test device is scientific and reasonable in design, exquisite and simple in overall structure, easy and convenient to test and operate, and capable of conducting constant-load stress corrosion detection on the test piece and online observing the corrosion process.

Description

technical field [0001] The invention belongs to the technical field of workpiece detection, and relates to a stress corrosion test device, in particular to an on-line observation test device for constant load stress corrosion under hydrofluoric acid environment. Background technique [0002] Stress corrosion is a corrosion problem caused by the coupling of force and chemistry. The stress corrosion test can evaluate the stress corrosion sensitivity of materials in different corrosive environments. Stress corrosion test methods include: constant strain, constant load and slow strain rate. Among them, the constant load method can be used to study the mechanism and stress threshold of stress corrosion cracking in materials. At present, the stress corrosion test devices that can realize constant load are relatively large and expensive, and are not easy to move and difficult to implement online observation. In addition, although hydrofluoric acid is a weak acid, it is highly corr...

AI Technical Summary

Problems solved by technology

At present, the stress corrosion test devices that can achieve constant load are relatively large and expensive, not easy to move and difficult to implement online observation

In addition, although hydrofluoric acid is a weak acid, it is highly corrosive and toxic, and can corrode almost all metals and etch glass. The boiling point of hydrofluoric acid at normal pressure is 19.54°C, and it is extremely volatile at room temperature. These characteristics It greatly limits the development of hydrofluoric acid corrosion research in the laboratory, and there is no stress corrosion test equipment in the hydrofluoric acid environment.

[0003] Therefore, based on the deficiencies in the above-mentioned prior art, a device capable of performing constant load on-line observation of stress corrosion tests in a hydrofluoric acid environment has been developed to ensure a light structure, easy to move, easy to operate, and at the same time prevent hydrogen The safety problems caused by the volatilization and leakage of hydrofluoric acid are of great significance to the study of stress corrosion of materials in hydrofluoric acid environment

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