A method for detecting the interface bonding fastness of aluminum-steel composite materials for brazing

Abstract

The invention provides a method for detecting the interface binding strength of an aluminum-steel composite material for soldering. The method can be used for accurately detecting the aluminum-steel interface binding strength and quantifying the interface binding effect of the aluminum-steel composite material for the soldering. The method comprises the following steps: firstly, preparing a test sample of the aluminum-steel composite material and carrying out a stripping test on the test sample; and calculating according to a test result to obtain a binding strength value of an aluminum-steel interface. The method is characterized in that the preparation of the test sample comprises the following steps: soldering and connecting a metal reinforced layer on the surface of an aluminum layer of the sample and forming a compound layer by the metal reinforced layer and the aluminum layer of the sample. The binding strength of the metal reinforced layer in the compound layer and the aluminum layer of the sample is greater than the binding strength of the aluminum-steel interface; in the stripping test, the compound layer and a steel layer in the sample are stripped by a tension tester.

Description

technical field [0001] The invention relates to the technical field of detection of metal layered composite materials, in particular to the field of detection of interfacial bonding fastness of metal layered composite materials, in particular to a method for detecting the interfacial bonding fastness of aluminum-steel composite materials for brazing. Background technique [0002] The brazed aluminum-steel composite material produced by "room temperature rolling and compounding" is widely used in electric power, automobile, petrochemical, construction machinery and other industries, and the typical application field is thermoelectric (thermal power, solar power, nuclear power) air cooling system. Taking the application of thermal power as an example, the air cooling system made of brazed aluminum-steel composite material replaces the cooling circulating water of the open large water tower, which can save 75% of water. Calculated by replacing 30% of domestic thermal power unit...

AI Technical Summary

Problems solved by technology

Generally, the bending test is used to detect the bonding effect, but the bending test can only qualitatively detect the bonding fastness of the interface. The rolled aluminum-steel composite materials that pass the bending may still have delamination at the aluminum-steel interface during brazing. The effect of the folding test is not ideal; the peeling test can be used to quantitatively measure the bonding fastness of the metal-to-metal bonded interface, such as figure 1 shown, but it is necessary to make stretching heads 3 and 4 on the metal samples 1 and 2. Since the free ends of the aluminum layer and the steel layer of the randomly cut aluminum-steel composite sample are connected and closed, it is necessary to The aluminum layer is peeled off from the steel layer, but because the aluminum layer is too thin, it is difficult to peel off, and the tensile strength is low, it is not suitable for the preparation of the leader, so the application of the peeling test on the aluminum-steel composite material is largely limited

How to successfully implement the peeling test of thin-coated composite materials has not yet found a feasible solution at home and abroad

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