Laser marking machine makes color on stainless steel surface

Color laser marking machines are different from ink deposition techniques and those that apply colored powders or films. More advanced lasers can change the color of plastics. The typical physical effect is the same as the thermal decomposition of polymers in an oxygen environment. In contrast, various colors can be produced on the surface of metal raw materials.

The principle of stainless steel color development, there are three color development methods: one is to generate colored oxides; the other is to generate a very thin layer on the surface of stainless steel under the action of chemical, electrochemical or laser. The colorless and transparent oxide film, the oxide film produces interference effect, it can show color on the surface; the third is a mixed state of colored oxide and oxide film at the same time.

The corresponding relationship between the color change and the laser energy in the stainless steel laser color marking, the laser thermal effect generated by the stainless steel surface under the action of the laser. Through the laser thermal effect, it is concluded that the laser energy fluorescence density is proportional to the film thickness. As the laser energy increases, the color of the stainless steel watch changes in the following color sequence: orange-red-purple-blue-green-blue-blue-green-green-yellow-green-yellow-purple-red.

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