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Exploration of Coating Wear Resistance Test Method
2024/07/24
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Coating wear resistance is one of the important indicators that cannot be ignored in material performance evaluation. During the use of coatings, they are often affected by various mechanical forces, resulting in surface wear. It is particularly important to scientifically and accurately evaluate the wear resistance of coatings in order to ensure their stability and durability in practical applications. This article will introduce several common methods for testing the wear resistance of coatings, including rubber wheel abrasive wear test, pin disc abrasive wear test, friction wear test, and sandblasting test, aiming to provide reference for the research and application of coating wear resistance.
1. Rubber wheel abrasive wear test
Experimental principle
This test method simulates the actual wear environment by dropping abrasive at a fixed speed between a rotating rubber wheel and a specimen. The rim of the grinding wheel is made of rubber with a specified hardness, and the sample is pressed onto the grinding wheel with a certain pressure through a lever system. The abrasive generates low stress wear on the sample during rotation. Evaluate the wear resistance of the coating by measuring the wear amount of the sample.
Sample requirements
The sample size is usually 50mm x 75mm, with a thickness of 10mm, and the surface needs to be flat without any attachments or defects.
Wear resistance evaluation
Evaluate the wear resistance of the coating based on the weight loss of the sample.
2. Disc type abrasive wear test
Experimental principle
In this experiment, sandpaper or sandpaper cloth is mounted on a disc as abrasive, and the sample is made into a pin type and pressed onto the disc sandpaper under a certain load pressure. When the disk rotates, the sample moves in a straight line along the radial direction of the disk, and the wear resistance of the coating is evaluated by measuring the weight loss of the sample.
Sample requirements
The sample is a cylindrical rod with a diameter of 4mm, and the end face should be flat without any attachments or defects.
3. Friction and Wear Test
Experimental principle
The friction and wear test is conducted by forming a friction pair between a circular specimen and a mating component (such as GCr15 or cast iron). The experiment can be conducted using dry friction or lubricated friction. Evaluate the wear resistance of the coating by measuring the weight loss of the sample.
Sample requirements
The sample is a circular shape with a diameter of 40mm x 10mm, and the surface should be flat without any attachments or defects.
4. Sandblasting test
Experimental principle
Sandblasting tests simulate the erosion and wear of coatings by gas or liquid carrying hard particles by spraying abrasive (such as corundum sand) onto the surface of the sample using a suction type sandblasting gun. Measure the weight loss of the sample after the experiment to evaluate the erosion and wear resistance of the coating.
Experimental apparatus and conditions
The experimental device is made of materials such as glass, brass, or stainless steel, and mainly consists of two coaxial fixed pipes. The gas supply flow rate is strictly controlled by the control valve. During the experiment, the sample is fixed on the test stand, and the abrasive is sprayed onto the surface of the sample through the inner tube.
Evaluation method
Spray abrasion coefficient and average wear resistance are two commonly used evaluation indicators. The abrasive coefficient is calculated based on the original film thickness and wear resistance parameters of the standard sample. The average wear resistance is based on the standard sample and expressed by measuring the wear amount of the sample.
There are various methods for testing the wear resistance of coatings, each with its own characteristics. Rubber wheel abrasive wear test and pin disc abrasive wear test are suitable for low stress wear environment; Friction and wear tests can simulate actual usage conditions; The sandblasting test is suitable for erosion environments where gas or liquid carries particles. By selecting and applying these testing methods reasonably, the wear resistance of coatings can be comprehensively evaluated, thereby improving the service life and performance of materials.
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