Method for measuring stretching stress corrosion of deforming aluminium alloy

Abstract

The invention discloses a method for measuring stretching stress corrosion of a deforming aluminium alloy. The method comprises the following steps: removing an alclad layer on the surface of a sample; measuring stress corrosion sensitivity through relative change of same mechanics parameters of the same sample exposed under contrast test environment and exposed under inertia environment; and measuring the threshold stress of stress corrosion according to a binary search method. The method for measuring the stretching stress corrosion of the deforming aluminium alloy is capable of performing quantification measurement on stress corrosion sensitivity of the aluminium alloy.

Description

technical field [0001] The invention relates to the technical field of stress corrosion testing, in particular to a method for measuring tensile stress corrosion of deformed aluminum alloys. Background technique [0002] At this stage, aluminum alloys are widely used materials in the aerospace field. Stress corrosion of aluminum alloys occurs in spacecraft from time to time, and has attracted the attention of officials in the aerospace field at home and abroad. As early as 1984, the Ministry of Aviation Industry of my country promulgated the "Deformed Aluminum Alloy Tensile Stress Corrosion Test Method" (HB5254-83) standard, and the European Space Standardization Cooperation Organization (ECSS) also promulgated "Metal Stress Corrosion Cracking Sensitivity" in 1998 Determination of "(ECSS-Q-70-27A) standard and "Material Selection for Inhibiting Stress Corrosion Cracking" (ECSS-Q-70-26A), and in 2008, the above-mentioned standard was revised, fully showing that aluminum alloy ...

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Problems solved by technology

[0003] However, the environmental conditions used in the ECSS standard to measure the stress corrosion of aluminum alloys are 3.5% NaCl alternating wet and dry environment, while the navigation mark in my country uses 3% NaCl + 0.5% H 2 o 2 solution, the stress corrosion sensitivity of the material is closely related to the environmental conditions, and it is impossible to determine which environmental conditions are closer to the actual environmental conditions

Secondly, the ECSS standard uses springs for constant load loading, while my country's navigation mark uses weights for constant load loading, and it is impossible to determine which loading method is more reasonable

[0004] In addition, the current methods of stress corrosion corrosion testing of aluminum alloys at home and abroad can only give the relative level of stress corrosion corrosion susceptibility of aluminum alloys, and cannot provide quantitative measurement methods for the stress corrosion corrosion susceptibility of aluminum alloys.

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