SU1441274A1 - Method of determining strength of adhesion of coating to substrate - Google Patents

Abstract

This invention relates to the field of tribology. The aim of the invention is to improve the accuracy by creating an uninterrupted power spectrum for the connection. In the test coating 2, to the substrate 1, a linear notch 3 and a series of three-distant cuts 4 are made. The connection is bent around the conical rod. The largest diameter d of the rod at which the coating peeled off from the substrate at the location of notch 3 is determined. Judging by the value of d, the strength of the joint is judged. 2 vp f-ly, 2 ill.

Description

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The invention relates to tribology and can be used in determining the strength of adhesion of a coating to a substrate.

The aim of the invention is to improve the accuracy by creating a continuous spectrum of force action on the connection.

Fig. A I shows the interaction Q outside the connection with the conical rod; in fig; 2 shows the dependences of the relative size of the destruction of the joint on the diameter of the coating rod XC-068; XB-785, XC-1100 on a substrate of steel 3, coated with scale or purified from oxidation products; a - HS-068 on scale; b - XB-785 on the scale; in - XB-785 on the cleaned surface; g - XC-1100 on scale; d - XC-1100 20 on the cleaned surface.

The method is carried out as follows.

A test coating 2 is applied to the surface of the substrate 1 (FIG. 1). In 25 coating 2, a straight notch 3 and a number of equidistant notches 4 crossing the straight notch 3,

The connection is placed on the conic of the diameter of the rod, about t L and h

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lump rod 5 so that the covering is wooded, and so that, with a view to rising from the outside, and straightforward. the incision was parallel to the Osts core, for which the incision line was oriented on one side with the help of a clamp 6j and on the other on the apex of the tapered rod.

Bend the connection around the rod. The diameter d of the rod, the linear dimension 1 of the delaminated part of the coating in the direction perpendicular to the straight linear notch and the length c are measured along the length of the straight line notch. arc of a rod covered by a substrate along its side adhered to the coating According to these measurements, the 1 / s dependence is constructed, f (d), which has a linear view (Fig. 2),

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precision, a tapered rod is used, a number of equidistant cuts are made to the substrate, perpendicular to the axis of the rod and crossing a straight line cut, at least at two points along the length of the straight line cut diameters d of cross sections of the rod passing through these points, linear dimensions 1 of the detached part of the coating in the perpendicular straight line notch direction and length from the substrate arches of the rod to the surface adhered to the coating, determine the dependence 1 / c f (d), and When dividing the joint strength, such a diameter d of the rod, obtained by linear extrapolation of the dependence 1 / s f (d), is taken into account, at which f (fl (sp) = 0.

By a linear extrapolation, the value of d (j is, such as, iTO f (dfiae 0) is found. From the value of d, the strength of the joint is judged, namely, the greater the strength is, the smaller.

EXAMPLE The strength of a joint made of XC-068, XB-785 and XC-1100 coatings on a substrate was made of steel - 3 coated (with a stitch or cleaned of oxidation products by mechanical means. Dimensions of the substrate 105 to l75x1.

As can be seen from FIG. 2, the strength of the adhered coatings deposited on the cleaned surface is greater than the adhesion strength of the same coatings applied over the surface of the metal coated with scale. The strength of adhesion with the cleaned surface of the coating is placed in the following order: XC-1100 XB-785 XC-068.

The proposed method is simple and quite effective in its practical implementation.

Claims (3)

1. A method for determining the adhesion strength of a joint of a substrate coated with a coating on it, consisting in that a straight cut is made in the coating to the substrate, the joint is bent around the rod so that the coating is outside and the notch is located in the axial plane of the rod, fix the destruction of the joint at the site of the incision and determine the bond strength with 5 u u and with the fact that, in order to improve 0 five 0 five precision, a tapered rod is used, a number of equidistant cuts are made to the substrate, perpendicular to the axis of the rod and crossing a straight line cut, at least at two points along the length of the straight line cut diameters d of cross sections of the rod passing through these points, linear dimensions 1 of the detached part of the coating in the perpendicular straight line notch direction and length from the substrate arches of the rod to the surface adhered to the coating, determine the dependence 1 / c f (d), and When dividing the joint strength, such a diameter d of the rod, obtained by linear extrapolation of the dependence 1 / s f (d), is taken into account, at which f (fl (sp) = 0. 2. The method according to claim 1, wherein the distance between the transverse incisions is chosen to be greater than or equal to the thickness of the joint. 3. The method according to claim 1, characterized by the fact that the h-th .. different size of the delaminated part of the coating is defined by U4127A by treating plant cuts from the substrate and measuring the thief dye with the subsequent size of its painted part.