Method for quantitatively testing bonding strength of coating and plating layer on surface of material and matrix

Abstract

The invention discloses a method for quantitatively testing the bonding strength of a coating layer on the surface of a material and a matrix. The method comprises the following steps: preparing a rectangular block-shaped matrix material, cutting the matrix from top to bottom in the vertical direction, cutting the matrix from outside to inside in the horizontal direction, and enabling a vertical cutting surface to vertically abut against and intersect with a horizontal cutting surface; depositing and growing a coating layer on the vertical cutting surface and the horizontal cutting surface until the outer surface of the coating layer is flush with the surface of the corresponding substrate; cutting off the whole part of the base body below the coating layer along the horizontal direction by taking the horizontal cutting surface as a boundary so as to obtain a sample formed by the coating layer and the base body with the corresponding thickness; processing the sample to obtain a tensile sample; the tensile sample is loaded on a tensile equipment platform for a tensile test, and the maximum stress when the bonding interface of the coating and plating layer and the base body is separated is the bonding strength of the coating and plating layer and the base body. According to the method, a binder is not used, and the bonding strength of the coating layer and the base body can be directly, effectively and quantitatively measured.

Description

technical field [0001] The invention belongs to the technical field of material surface engineering, in particular to a method for quantitatively testing the bonding strength of a material surface coating and a substrate. Background technique [0002] In the past 20 years, the surface engineering of materials has developed rapidly, among which coating and coating are called one of the most active fields, which are widely used in machinery, electronics, chemical industry, biology, aerospace and other fields, and have achieved huge economic and social benefits. However, no matter what the process is, if the prepared coating, coating, etc. are not well bonded to the substrate, easy to peel off, and broken, then no matter how excellent the performance of the coating itself is, its use value will be greatly reduced. Therefore, for coating materials, the bonding performance between them and the substrate is a very important parameter of mechanical properties. [0003] At present,...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: 1) A binder is required, and coatings that are poorly bonded to the binder will not be applicable

2) The introduction of binders complicates the results, causing errors in the test results, and the results of the same coating using different binders may have large differences

3) The interfacial bonding strength is meaningful only if it is less than the bonding strength. For example, the maximum tensile strength of epoxy resin bonding agent is 70MPa, so the coating with bonding strength higher than 70MPa will not be usable

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