Application industries and classifications of coating thickness gauges
Application industries and classifications of coating thickness gauges
The application industries of coating thickness gauges are distributed in electroplating, spraying; pipeline anticorrosion; aluminum profiles; steel structures; printed circuit boards, and screen printing, etc.
Electroplating and spraying: This industry uses our instruments a lot, accounting for a considerable proportion of annual sales. It is our main user group and requires energy to continue to dig.
Pipeline anticorrosion: There are many users mainly in petrochemical industry, generally the anticorrosion layer is relatively thick, and there are many users of KY8001 and KY8002 thickness gauges;
Application industries and classifications of coating thickness gauges
Aluminum profile: Affected by the country’s implementation of mandatory standards and the renewal of licenses by profile companies since the beginning of this year, the industry has shown a good momentum. It mainly measures the oxide film on the profile. "150 yuan is very considerable, so the state mandates that relevant testing equipment including coating thickness gauges be equipped. This move also brought us a very good opportunity. This opportunity has also attracted the attention of competitors, who lowered the price to a great extent, and quickly launched an offensive in this industry by means of distribution and other methods.
Steel structure: For our products, this type of enterprise can also be classified as an industry alone. Coating thickness gauges are indeed widely used in this industry, and manufacturers including iron towers also have more recent purchase information;
Printed circuit board, and screen printing, etc.: These enterprises are relatively special industries, and the purchase volume currently only comes from a few sporadic manufacturers.
Application industries and classifications of coating thickness gauges
The detection principle of the coating thickness gauge
The principle of magnetic thickness measurement: when the probe is in contact with the coating, the probe and the magnetic metal substrate form a closed magnetic circuit. Due to the existence of the non-magnetic coating, the reluctance of the magnetic circuit changes. By measuring the change, the coating thickness can be calculated. thickness.
The principle of eddy current thickness measurement: use high-frequency alternating current to generate an electromagnetic field in the coil. When the probe is in contact with the covering layer, an eddy current is generated on the metal substrate and has a feedback effect on the coil in the probe. By measuring the size of the feedback effect The thickness of the covering layer can be exported.
According to the detection principle of the coating thickness gauge: it can be divided into magnetic coating thickness gauge, that is, the substrate to be measured is magnetic, such as steel, iron, etc., and there is also a non-magnetic coating thickness gauge as the name implies. , Also called eddy current thickness gauge, if the substrate is aluminum. There is also a dual-function coating thickness gauge, which means that whether its substrate is iron or aluminum, it can be automatically identified. Customers can choose according to their measurement needs.
What are the factors that affect the accuracy of the measurement value of the coating thickness gauge?
1. Magnetic properties of the base metal: The thickness measurement by the magnetic method is affected by the magnetic change of the base metal (in practical applications, the magnetic change of low carbon steel can be considered slight). Calibrate the instrument with a standard sheet with the same properties as the base metal of the piece; it can also be calibrated with a test piece to be coated.
2. Base metal thickness: Every instrument has a critical thickness of base metal. Above this thickness, the measurement is not affected by the thickness of the base metal. See attached table 1 for the critical thickness value of this instrument.
3. Electrical properties of the base metal: the electrical conductivity of the base metal has an impact on the measurement, and the electrical conductivity of the base metal is related to its material composition and heat treatment method. The instrument is calibrated using a standard sheet having the same properties as the base metal of the test piece.
4. Edge effect, the coating thickness gauge is sensitive to the sudden change of the surface shape of the test piece. It is therefore unreliable to measure near the edge or inside corners of the test piece.
5. Curvature: The curvature of the test piece affects the measurement. This effect always increases significantly with decreasing radius of curvature. Therefore, measurements on the surface of curved test pieces are not reliable.
6. Deformation of the test piece: the probe will deform the soft covering layer test piece, so reliable data can be measured on these test pieces.
7. Surface roughness: The surface roughness of the base metal and the covering layer has an impact on the measurement. The greater the roughness, the greater the impact. Rough surface will cause systematic error and accidental error, and the number of measurements should be increased at different positions for each measurement to overcome this accidental error. If the base metal is rough, it is also necessary to take several positions on the uncoated base metal test piece with similar roughness to calibrate the zero point of the instrument; or use a solution that does not corrode the base metal to dissolve and remove the covering layer, and then calibrate the instrument. zero.
8. Attached substances: The instrument is sensitive to those attached substances that prevent the close contact between the probe and the surface of the covering layer. Therefore, the attached substances must be removed to ensure that the probe of the instrument is in direct contact with the surface of the test piece.
9. The orientation of the measuring head of the coating thickness gauge: the placement of the measuring head has an influence on the measurement. During the measurement, the probe should be kept perpendicular to the surface of the sample.
10. Probe pressure: The pressure exerted by the probe on the test piece will affect the measurement reading, so keep the pressure constant.
11. Magnetic field: The strong magnetic field generated by various electrical equipment around will seriously interfere with the magnetic thickness measurement work.
Related products are: Digital Vibration Meter, Ultrasonic Flaw Detector, Ultrasonic Thickness Gauge, Leeb Hardness Tester, Coating Thickness Gauge, Portable Vibration Meter, Underground Pipeline Leakage Detector, Underground Pipeline Anticorrosion Layer Detector, EDM Detector
