Detection method for improving part contrast by using detection liquid and preparation method of detection liquid

Abstract

The invention discloses a detection method for improving part contrast by using detection liquid and a preparation method of the detection liquid. The detection method comprises the following steps of: step 1, taking a part with a corroded surface, and then washing and drying the part; step 2, uniformly coating the whole surface of the part with the detection liquid, repeating for a plurality of times to cover an uncoated region, and automatically converging the detection liquid on the edge of the lower side under the action of gravity; step 3, placing a finished product in the step 2 for 3 to5 minutes; and step 4, detecting a macrostructure of the part by using a measuring tool for the finished product in the step 3. Carbomer 940 forms clear and transparent gel to stably wrap the surfaceof the part, and glycerol enables a liquid film to keep wet for a long time, so that the spreadability of the detection liquid is improved, and the problems of too fast volatilization and poor spreadability are solved; the detection liquid does not dry up on the surface of the part for 1 to 3 days, so that the problem that the detection liquid is not easy to remove is solved; and under illumination, the angle of the part is turned over for visual inspection of the macrostructure, so that the problems of low detection accuracy and low efficiency caused by water fluctuation are solved.

Description

technical field [0001] The invention relates to a detection method for improving part contrast by using a detection liquid and a preparation method of the detection liquid, belonging to the technical field of part surface detection. Background technique [0002] The display of low-magnification tissue is through the etching effect of chemical reagents, which makes the metal surface uneven, resulting in the brightness difference of reflective ability. The principle is: after the external light is refracted by the water surface, the light enters the concave-convex gap after metal etching at a steeper angle, which means that the area with concave-convex gap is reflected less light and the brightness becomes darker. , thereby improving the brightness difference of low-magnification tissues. [0003] However, the observation of metal low-magnification structures in water has the following problems: 1. When operating large-sized parts such as turbine discs, the water surface will...

AI Technical Summary

Problems solved by technology

[0002] The display of low-magnification tissue is through the etching effect of chemical reagents, which makes the metal surface uneven, resulting in the brightness difference of reflective ability. The principle is: after the external light is refracted by the water surface, the light enters the concave-convex gap after metal etching at a steeper angle, which means that the area with concave-convex gap is reflected less light and the brightness becomes darker. , thereby improving the brightness difference of low-magnification tissues

[0003] However, the observation of metal low-magnification structures in water has the following problems: 1. When operating large-sized parts such as turbine discs, the water surface will fluctuate, and the fluctuation of the water surface will affect the reflection of the water surface, thereby reducing It improves the accuracy and efficiency of the low-magnification tissue detection of parts; Second, because the measuring tool is prone to erosion after contact with water, if ordinary water or ethanol is coated on the low-magnification tissue, there will be problems of too fast volatilization and poor spreadability , which affects the accuracy of low-magnification tissue detection of parts