Automatic scratch test to evaluate film strength, hardness, adhesion

With the continuous development of coating technology, the requirements for coating film performance are becoming higher and higher. In this context, the digital automatic scratch tester emerged as the times require and has become an important tool for evaluating physical properties such as coating film strength, hardness, adhesion, etc. This instrument is designed to comprehensively evaluate the performance of the coating film by simulating the penetration resistance of the scratch needle when marking the coating, including key indicators such as film strength, hardness and adhesion.

Testing purposes

The emergence of digital automatic scratch testers has greatly helped us evaluate coatings. You can think of it as a "coating health checker" that helps us understand the physical properties such as strength, hardness, adhesion and so on of the coating film. These properties directly determine whether the coating will be damaged during use, such as abrasion resistance, abrasion resistance, scratch resistance, impact resistance, etc. The purpose of this instrument is to measure the performance of the coating film by simulating a scratch condition under real use conditions, in order to judge the quality of the coating and help us choose more durable coatings. Therefore, the significance of this instrument is to improve our understanding of coating performance and help ensure that the coatings we choose and use can perform well in actual applications.

The physical properties of the coating film are directly related to the actual use effect of the coating, such as the requirements for wear resistance, abrasion resistance, scratch resistance, impact resistance, etc. The size of these properties will directly affect the performance of the coating film in different use environments, including the retention effect of the coating film, the ease of cleaning, etc. Therefore, the purpose of the digital automatic scratch tester is particularly critical. It can provide a scientific basis for the quality control of coatings by accurately measuring the penetration resistance of the paint film sample coating when it is scratched by a scratch needle.

working principle

The working principle of the instrument is based on digital touch screen control, which is easy and flexible to operate. The design of the scribing needle frame and workbench ensures that the scribing needle acts vertically on the coating film sample. By accurately controlling the test length and test speed, a comprehensive evaluation of the coating film performance is achieved. The design complies with the GB9279 standard, making it a standard tool for coating film performance evaluation. The digital automatic scratch tester realizes comprehensive evaluation of coating performance through an advanced digital touch screen control system. Its main working principle is based on the interaction between the needle holder and the workbench. During the test, the coating sample is fixed on the workbench, and the scribe needle on the scribe rack acts vertically on the surface of the coating sample. Through the digital control system, we can set the length, speed and return speed of the test at will. When the test is started, the scratch needle moves back and forth on the sample plate, simulating the actual use situation of scratching. During the test, the penetrating ability of the scratch needle on the coating film sample will be detected through electronic circuits, and the lost energy will be transferred to the processor and eventually converted into a displayable scratch resistance value of the coating film. This process ensures the accuracy and reliability of the test. Therefore, the working principle of the digital automatic scratch tester can be briefly summarized as realizing the reciprocating motion of the scratch needle on the coating film sample through digital control, measuring the anti-penetration ability of the coating film during the scratching process, thereby evaluating the strength, hardness, and strength of the coating. physical properties such as adhesion.

During use, the preparation of coating samples is carried out in accordance with relevant standards, and the environmental requirements of the instrument are also fully considered. It is easy to operate. You only need to set the test length and test speed to start the test. During the test, the scribing needle moves back and forth on the sample plate to observe whether the coating film is scratched. Through multiple tests, the average value is taken to obtain the scratch resistance value of the coating film, which provides important reference data for coating production and research and development.

In order to ensure the long-term use of the instrument, maintenance work is also particularly important. Prompt lubrication, regular inspection of fasteners, protection from dust, moisture, and corrosion all help to maintain the stability and accuracy of the instrument. The introduction of digital automatic scratch testers has undoubtedly provided the coatings industry with a more reliable and efficient coating film performance evaluation tool and promoted the advancement of coatings technology.