< img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=6676106302419263&ev=PageView&noscript=1" /> What are the advantages of electrolytic etching over chemical etching?
By jett NG | 17 April 2021 | 0 Comments

What are the advantages of electrolytic etching over chemical etching?

What are the advantages of electrolytic etching over chemical etching?


First, what is electrolytic etching?

Electrolytic etching is to make use of the principle of anodic dissolution of metal in the liquid with salt water as the main etching body, and etch the metal under the action of electrolysis. Switch on the etching power, so as to achieve the purpose of etching.

Two, what are the advantages of electrolytic etching?

Metal surface etching graphics and text, before is the use of acid or alkaline etching, now most sign production enterprises are still in this way.

Chemical etching application is more common, can etch a variety of signs, elevator board, handicrafts, circuit boards, etc. But for some special metal materials or higher requirements, etching deeper decorations, there are certain difficulties. In this case, electrolytic etching can be used to solve the problem.


Electrolytic etching and chemical etching compared, you will find that electrolytic etching can deal with a variety of metal materials, and chemical etching is generally dealing with copper, stainless steel and aluminum. But many metals dissolve in the electrolyte.

Because the electrolysis etching is mainly by current electrolysis, so the composition of the electrolyte is relatively simple, the cost is low, generally is to use salt water, the corrosion of the solution is very small, the protection requirements of the equipment is low, and the environment will hardly cause any pollution. The second is that the etching depth can be achieved by electrolytic etching will be higher.


In addition, electrolytic etching along the protection layer lateral corrosion is small, for the need to etch a large area of the convex sign, can make the strokes do not deform, three-dimensional sense, good decorative effect. Therefore, in some cases where chemical etching cannot be solved, the use of electrolytic etching can be considered.


Although electrolytic etching has great advantages over traditional chemical etching, electrolytic etching also has its disadvantages. For example, electrolytic etching requires power supply equipment and related devices, and the use of anti-etching materials requires both corrosion resistance to electrolytes and good insulation performance. In addition, electrolytic etching needs to consume electricity, a large investment. Therefore, for hardware signs and some manufacturers of etching arts and crafts, the use of chemical etching or electrolytic etching needs to be considered in many aspects, but electrolytic etching is certainly a future trend of etching.

Three, the principle of electrolytic etching

Electrolytic etching is the actual electrolysis of some metal materials, such as electrolytic copper, iron, etc. The specific approach is to be etched parts as the anode, with corrosion-resistant metal materials as an auxiliary cathode. The anode is then connected to the positive terminal of the power supply and the auxiliary cathode to the negative terminal of the power supply. When the current passes through the electrode and the electrolyte solution, the electrochemical reaction takes place on the surface of the electrode and the electrolyte solution. By using this reaction, part of the metal that will be dissolved and removed will be removed to achieve the purpose of metal corrosion.

According to Faraday's law, the amount of electricity that passes through is proportional to the amount of metal that is dissolved, meaning that the more metal is etched, the more electricity is consumed. According to the principle of electrochemistry, after the power supply of the electrolytic etching device is switched on, the oxidation reaction takes place on the anode and the reduction reaction takes place on the auxiliary cathode. The result of the anodic reaction is that the metal at the etching site is oxidized into hydrated or complex ions into the electrolyte solution. As a result, the metal at the etching site is constantly dissolving and leaving an equivalent electron on the metal's surface. Electrolytic etching is mainly the use of current to accelerate the dissolution of metal etching parts, rather than chemical etching that to add a variety of additives, especially accelerant.


Why the etching process? The advantages of etching processing!


The research and development speed is fast, the development cost is low, and the modification design is convenient, compared with the stamping without the production of expensive abrasive tools, etching processing only needs to make film to complete the prototype design; To maintain the properties of the metal raw materials, other processing methods (such as laser cutting and stamping) may change the properties of the metal due to thermal or mechanical stress during production;


High production capacity, low cost repeatability of complex design, mass production quickly, a few hours, a few days to complete mass production; No burr, different from mechanical processing, chemical corrosion processing out of the product almost smooth no burr;

High precision, low tolerance. Small tolerances can be 0.005mm, micropore diameter can be 0.03mm, wire diameter can be 0.015mm, uniformity can be +/-0.03mm

Stainless steel etching with what photosensitive ink, which kind of etching ink etching effect is better


Four, electrolytic etching ink


Electrolytic etching ink, is the screen printing spraying on the metal surface, play the role of anti-electrolysis, protect the part that does not need to be electrolyzed from being damaged. You can use DD-1602 ink to protect.


When it comes to stainless steel etching, we must first understand what is stainless steel etching.

The so-called stainless steel etching, is through the method of chemical corrosion on the surface of stainless steel etched out a variety of patterns. The more common are stainless steel door plate and stainless steel elevator plate. There are stainless steel case, glasses frame and a variety of stainless steel souvenirs above the pattern and text is the use of chemical corrosion.

Since the text on the stainless steel graphics is through corrosion, so do not need to corrode the part will be protected, play the role of anti-corrosion protection material is ink, generally use photosensitive ink, the color is blue. Thermosetting inks are also available in black and blue colors. Stainless steel etching on the corrosion resistant ink, the use of screen printing and spraying mainly in two ways. So what photosensitive ink is better, which requires photosensitive etching ink, both screen printing and spraying. DD-1602 is a photosensitive anti-etching ink that can be used for screen printing and spraying.

A lot of photosensitive etching ink, screen printing or spraying, need to be pre-dried, baked in the oven for ten minutes and then exposed. But stainless steel etching, such as etching elevator plate, door plate and now more popular etching landscape painting. Are a large piece of stainless steel plate, if you need to bake, you will need a large oven, the operation cost is high, but also more trouble. At this time you need ink to be able to dry naturally. Stainless steel exposure development etching pattern, also need to ink. If an anti-etching ink, ink is not clean is also very troublesome, the use of sodium hydroxide aqueous solution to ink, ink time 1-3 minutes, the temperature is maintained at 50-80 degrees Celsius can be.

Said the stainless steel etching ink, then which one of the etching ink etching effect is better? Photosensitive ink etching effect is better, must say under Taiwan Chuanyu PR-2000SA. Why this sensitive etching blue oil? Remember more than a decade ago, when Nokia phones were still popular in the market. Nokia phones, as well as Motorola and some domestic feature phones, all have stainless steel or aluminum backs. The back cover of the brand LOGO and a variety of graphics, are made by etching. Chuanyu's PR-2000SA was widely used at that time. So many do circuit boards, but also use PR-2000SA to etch the line.

Now there are many kinds of anti-etching ink, we should choose the right anti-etching ink for their own etching products. Stainless steel is the use of acid etching, so choose good acid resistance etching ink, if it is a fine line, it requires high resolution. Etching is deep, it is recommended that before etching, under baking, ink self-drying, how much will affect the ability to resist etching.

Entering a new era of jet etching

The previous etching is the use of screen printing: film - exposure - development etching, but jet printing technology for us to open a new door to digital etching, relative to screen printing, jet printing saves too much process, equipment, labor and supplies. After many years of printing technology, its nozzle control technology and multi-pass printing has been relatively mature, for large stainless steel plate and elevator door decorative plate has been used by many customers and put into production for a long time. For single-layer circuit board, has been tested and etched for many times, now has the ability to achieve its jet etching, etching line without trachoma, no short circuit.


Metallic sign etching method

In the market, there are many kinds of metal, the process of etching process is also different, one of the signs etching is now more common form, because of lower cost, stable income is very popular, but now more and more personalized set if using the traditional process, from artificial, material, space, time, etc will greatly enhance, customers worry the samples, The boss is anxious to give the sample, but the process link can not be less, the construction period is long, the time is tight, the sample is not satisfied but also repeatedly modified, really let the etching boss headache. This is the current stage of the etching industry common.

So let's take a look at the etching process of metal signs.

I. Traditional crafts:

Traditional sign etching method: it is a process method to process metal parts by photochemical reaction and etching. Signs etching method make full use of current computer aided design technology, will need processing graphics made into film, then put the film graphics by photochemical reaction is copied to the surface of metal materials, formed in the metal surface be protected metal parts graphics, again through the method of etching, dropped the unprotected metal material corrosion to produce metal parts.

II. New technology:

New sign etching mask printing etching method: just input the text and text you need to the computer, through the etching excellent mask printer, print out, directly take to etch it.

Obviously from the operation process, etching excellent version is an efficient, fast and high quality products, such products can greatly reduce labor costs for customers, greatly reduce the process procedures, reduce the cost of production materials, improve the production efficiency of enterprises, reduce the process advantages of various pollution emissions.


Traditional process always waste my time in the early stage of the etching, the consumption of many aspects, such as artificial is obvious, as the saying goes, time is money, in the rapid development of society, to save time is to save everything, so etching optimized version is for you to save the operation process, provide the fast and convenient and efficient products. Save everything you can't save before!


And as the future development of processing etching plant, environmental protection is the top priority. From the point of view of environmental protection and the need for survival, it is very important for every processing enterprise to put pollution prevention and environmental protection in the first place when designing the process. The traditional processing of metal etching processing factors are mainly acid, alkali and ferric chloride, the waste coating must be properly handled, not casually discharged. So the pollution to the environment is still very serious. From the point of view of etching process, contribution to environmental protection, etching superior version of this product has been very effective in reducing the emission of various pollution, or is a very environmentally friendly product

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