The invention belongs to the technical field of detection on automobile parts, and provides a detection method for measuring thicknesses of multiple
coating layers. The detection method comprises the following steps:
cutting a sample part to be detected, burnishing vertically to the cross section of a sample, properly
polishing the sample, putting the sample on a measuring table of a
microscope, regulating the
amplification factor of the
microscope, observing under the 100-1000-fold
microscope, observing by adding a cold
light source on the side surface of the sample to be detected, and measuring the thicknesses of the
coating layers at the same time. The detection method has the advantages as follows: by varying the light line and the
light intensity of the microscope, a layering problem of the
coating layers with similar colors, such as an ED layer and a primer layer, white paint and
varnish as well as black finishing paint and
varnish, can be effectively solved, thus avoiding a special sampling cumbersome procedure in the production process; the detection method is accurate in detection and high in reliability; a reliable basis is provided for routine detection and defect analysis of
metal and plastic coating products.