If there are two different thickness of coatings,can we observe the difference in coating thickness through the eyes?
In the used car industry,some experienced used car appraisers can observe whether the used cars are repainted,but we can't confirm whether they are identified by thickness.Under normal circumstances,the paint film thickness after repainting will increase,but there is basically no difference in appearance from the new car.People who want to purchase the used car can hardly distinguish the difference between the paint film thicknesses
Electroplating,powder coating,etc.may be used in other industries.In order to determine whether the coating thickness is up to standard, some standard coated samples may be prepared for comparison with the observation.But even so,the coating difference between thicknesses is still difficult to confirm with the human eye unless there is a big difference.Therefore,to determine the coating thickness and the difference between the different positions,the best method is to use a professional coating thickness gauge to measure and show scientific data.
There are many ways to measure the coating thickness.Common methods are gravimetric, mechanical,optical,radiation,photothermal,sonic,magnetic and eddy.Among the instruments using the last three measurement methods are ultrasonic coating thickness gauges,magnetic and eddy current coating thickness gauges.The coating thickness gauges offered by Linshang Technology use magnetic and eddy current methods.Suitable for coating thickness measurement on various metal substrates.
In the used car industry, many car owners will repaint the cars that have already suffered from the smashing.It is difficult to find the difference between the new car and the used car through the human eye.But the position of the repainting can be found by measuring the coating thickness.The thickness of the post-coating must be higher than the original paint thickness,so a coating thickness gauge is needed to measure the used car coating thickness.
In some industries of various metal materials such as steel,since the metal is easily oxidized by exposure to air,an inactive metal is plated on the metal surface to prevent oxidation,or a coating such as paint is applied to prevent corrosion. However,coatings that are too thick or too thin can affect the effect, so a coating thickness gauge is needed to detect the thickness.
In addition,there are many industries that use coating thickness gauges to ensure the process,such as whether the powder coating is uniform and whether the thickness is up to standard.
Coating thickness gauges can be classified according to different classification criteria.
1) According to the measurement principle, it can be divided into magnetic flux coating thickness gauge; magnetic suction coating thickness gauge; eddy current coating thickness gauge;magnetic method and eddy current double principle coating thickness gauge;ultrasonic coating thickness gauge;electrolytic coating thickness gauge and X-ray coating thickness gauge.
2) According to the structure of the host and the probe, it can be divided into integrated and split coating thickness gauges.
3) According to the range size, 2mm, 5mm and a larger range of coating thickness gauges can be divided.
4) According to different data transmission functions, it can also be divided into Bluetooth models and coating thickness gauges that support USB data export function.
Linshang coating thickness gauge mainly uses the Hall Effect (magnetic flux method) and eddy current principle. The standards based on the product are as follows:
1)GB/T 4956-2003 Measurement of non-magnetic coating thickness on magnetic substrate--magnetic method
2)GB/T 4957-2003 Non-conductive coating thickness measurement on non-magnetic base metal - eddy current method
3)Determination of paints and varnishes film thickness according to DIN EN ISO 2808
4)JJG-818-2005 Calibration procedure for magnetic and eddy current cover coating thickness gauge