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Your location: Home > Related Articles > What are the most commonly used wear test methods in the world معدات اختبار

What are the most commonly used wear test methods in the world معدات اختبار

Author:QINSUN Released in:2022-12 Click:184

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For wear testing, you can use scratch tester, vibration tester, linear carrier and other testing instruments, these instruments however, have specific experimental methods. So, what are the most commonly used wear test methods in the world? Below, Shanghai Qinsun will bring you relevant introductions.

1. Rotating friction rubber wheel method

Although the method and instrument specified in the national standard GB/T1768--79(89) have the same working principle, but the rotational speed of the rotating disc is not clearly specified, and the test results are expressed only by a single method of mass loss of the coating (weight loss method) after grinding with the specified number of grinding rotations. The rotating friction rubber wheel method can be widely used in coatings, coatings and abrasion resistance testing of metal and non-metallic materials, mThe rubber grinding wheel used for sharpening should be regularly trimmed and updated over time. The international standard ISO 7784.2--97 stipulates that the wear resistance of the coating is measured by the method of rotating friction rubber wheel, that is, under the specified test conditions of the rotating speed of the rotating disc at 60r/min and the pressure arm reaching a certain load, the rubber wheel embedded with emery is used. The hard rubber friction wheel of the abrasive wears the surface of the coating, and the wear resistance can be calculated by the average value of the mass loss of the coating (weight loss method) after grinding with a certain number of grinding revolutions or by the average grinding required to achieve a certain layer thickness There are two ways to express and evaluate the number of revolutions (speed method). Compared with the two, the weight loss method has strict requirementsn the weighing accuracy of the sample, but is not affected by the thickness of the coating; While the revolution method is intuitive and convenient in measuring without weighing, but measuring the grinding thickness of the coating requires very strict.

Second, the test method of coatings abrasion resistance

Coatings abrasion resistance refers to the ability of the coating surface to resist a certain mechanical action, usually measured by means of a grinding wheel or a sand impact test. It is one of the important characteristics of coatings that are often subject to mechanical wear during use and is closely related to other physical properties such as hardness, adhesion and flexibility of the coating. Commonly used test methods for coating wear resistance at home and abroad and their main technical characteristics.

Third, the erosion test method by falling sand

At thishe test method, the choice of the abrasive with natural sand has a direct influence on the test results, so the sand The requirements for hardness, particle size and geometric shape are strict. The national standard GB/T5237.5-2000 stipulates that the standard sand that meets the requirements of the standard GB/T 178-77 must be used as an abrasive. ASTMD 968-93 stipulates that the abrasion resistance of organic coatings should be measured by a falling sand abrasion tester, that is, the natural quartz sand of the specified place of origin is used as an abrasive, and it falls freely through the test tube from a certain height to abrade the surface of the sample, and the wear resistance is determined by the wear. The volume (L) of abrasive consumed by the coating per unit thickness of the area, and the abrasion resistance of the coating was evaluated by calculating the abrasion resistance coefficient. It should be pointed out thatin the above two standards using the falling sand erosion test method, although the abrasion resistance tester is used with the same main technical parameters, because the particle size of the natural sand abrasive used is different, the isotropic outflow volume is 2L abrasive The flow rate is not the same, the first is specified as 21 ~ 23.5s, and the latter is specified as 16 ~ 18s.

Four, sandblasting impact test method

ASTM D 658 -81 (86) stipulates that organic coatings should be measured by jet abrasion (sandblasting) test wear resistance, this method is to adjust the output pressure of the air pump so that the air flow rate at the nozzle of the tester is 0.07 m 3 /min, to ensure that (44 ± 1) g of emery jets are sprayed average per minute to achieve the coating and the wear resistance of the coating is evaluated by calculating the wear resistance coefficient ofthe mass (g) of abrasive consumed by the unit thickness of the coating wearing the specified area. Therefore, silicon carbide with a particle size range of 75-90 μm should be selected as an abrasive according to the standard, and the output pressure of the air source and the uniform spraying speed of the abrasive become the decisive factors influencing the test results.

5. Reciprocating wear test method

mg), and evaluate the wear resistance of the coating by calculating the wear resistance. Both ISO 8251-87 and JIS H8682 specify the measurement of abrasion resistance of anodized films on aluminum and aluminum alloys using a friction wheel wear tester. This test method is to make the coating layer and abrasive sandpaper glued to the outer edge of the friction wheel move back and forth in a plane under the specified test conditions, and the friction wheel rotates at a small angle (0.9o)after every double hit. The test conditions are easy to control, and there are no problems such as grinding wheel dressing, aging, sand flow rate, sandblasting shape, etc., which are difficult to control in other methods, so the repeatability of the test results is good. It is widely used in the abrasion resistance test of plastic, rubber and metal materials.

My country already has a national standard GB/T1768-79(89) "Determination of abrasion resistance of paint films". Abrasion resistance of fluorocarbon paint film on the surface of aluminum alloy building profiles. In summary, it is not difficult to see that there are different methods for testing the abrasion resistance of paint coatings at home and abroad, each with its own characteristics. Although people have different views on the above different test methods and their application performance evaluation, as for the development and promotion of multiple detection methods, therotating friction rubber wheel method, the falling sand method and the sandblasting method are still used. law is more common.

Until now, industrially developed countries have corresponding wear test methods for different materials, such as the Japanese industrial standard JIS H8503 that defines the relevant test method for metal film wear resistance; JIS H8615 describes the abrasion resistance test of chrome electroplating layer; and, for example, ASTM D 968-93 and ASTM D 658-81 (86) of the American Society for Testing and Materials define the falling sand method and the sandblast method, respectively. The sandblast method is used to measure the abrasion resistance of organic coatings; in the international standard SO7784.2-97, the rotating friction rubber wheel method is used to determine the abrasion resistance of paints and varnishes; in IS08251-87 and JISH8682, friction The wheel wear tester is used to determine the abrasion resistance coefficient of the anodized film on the surface of aaluminum and aluminum alloy.