Simple Principle Of Electrolytic Coloring
| Electrolytic coloring is caused by the reduction of metal ions on the barrier layer at the bottom of the membrane hole. |
But the barrier layer of aluminum is not chemically active. The key to electrodepositing metal on the barrier layer is to activate the barrier layer. Electrolytic coloring uses sine wave alternating current, that is, the polarity change of the alternating current is used to activate the barrier layer, the barrier layer is damaged in the negative half cycle, and the positive half cycle is oxidized and repaired, so that the barrier layer is activated. So electrolytic coloring uses alternating current. So how can alternating current reduce metals? This is because the barrier layer has semiconductor characteristics and can perform rectification. When the potential of the counter electrode is higher (positive) than the potential of the aluminum part, the negative component of the current on the aluminum part side will dominate. Under the effect of the cathodic reduction, metal ions that diffuse into the pores of the membrane are reduced and precipitated.
Studies have shown that noble metals, copper and iron group metal ions are reduced to metal colloidal particles, and some oxo acid radicals such as selenate, molybdate, and permanganate are reduced to precipitate as metal oxides or metal compounds, and are deposited on the film wall.
The tint of electroless plating coloring varies with the type of metal salt and the amount of metal deposited. In addition to the characteristic color of the metal, it is also related to the size, shape and particle size distribution of the metal colloidal particles. If the size of the colloidal particles is in the visible light wavelength range, Light waves are selectively absorbed and diffused so that different shades can be seen.
Link to this article： Simple Principle Of Electrolytic Coloring
Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting:https://www.cncmachiningptj.com/，thanks！
PTJ® provides a full range of Custom Precision cnc machining china services.ISO 9001:2015 &AS-9100 certified. 3, 4 and 5-axis rapid precision CNC machining services including milling, turning to customer specifications,Capable of metal & Plastic machined parts with +/-0.005 mm tolerance.Secondary services include CNC and conventional grinding, drilling,die casting,sheet metal and stamping.Providing prototypes, full production runs, technical support and full inspection.Serves the automotive, aerospace, mold&fixture,led lighting,medical,bicycle, and consumer electronics industries. On-time delivery.Tell us a little about your project’s budget and expected delivery time. We will strategize with you to provide the most cost-effective services to help you reach your target,Welcome to Contact us ( [email protected] ) directly for your new project.
Link to this article：Simple Principle Of Electrolytic Coloring
Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting.：Silicone And Casting，Thanks！^^
