The principle of etching liquid selection

The principle of etching liquid selection

In order to reduce environmental pollution, the etching system in alkaline environment should be chosen as far as possible.Of course, not all metals can perform meaningful etching in alkaline environment. Among the commonly used metals, only aluminum, copper and zinc can choose alkaline etching system.Alkaline etching system should not be used for copper etching in places requiring immersion etching.

1. Selection of stainless steel etching system

Stainless steel etching solution has two formulations, by the vast majority of etching plant to use iron trichloride mainly etching solution, and then according to the need to add some can increase the etching performance of the added substances, such as nitrate, phosphoric acid, hydrochloric acid, sulfur, benzodiazepine oh, ullotopine, lorate, etc.;(2) the use of nitric acid, hydrochloric acid, phosphoric acid preparation of water etching solution, this etching solution prepared after the need to use mild steel to aging, and then through the analysis of the adjustment to the process concentration range.

2. Selection of copper and alloy etching system

The choice of copper and alloy etching solution has a large degree of freedom, the commonly used etching system is three iron sulfide etching system, acidic copper chloride etching system, alkaline copper sulfide etching system, sulfuric acid hydrogen peroxide etching system, the use of more iron sulfide etching system and alkaline copper chloride etching system.In these etching systems, the solution of sulfuric acid-hydrogen peroxide etching system is easy to be regenerated, and the copper in the etching solution is easy to be recovered.

Although ferric chloride etching system has high environmental pollution, it is easy to prepare, low cost and easy to manage, so it is widely used.In the actual production of iron trichloride etching system is also used more methods (circuit board using alkaline rice copper etching system more).

3. Selection of iron metal etching system

In the metal etching commonly used iron metal is mainly a variety of die steel, the vast majority of them are the etching of the graph and text of the mold.There are two kinds of etchings: ferric chloride etchings and acid etchings.The former is easy to make up, and the metal surface after etching has good luster, which has better etching effect on a variety of metal materials.However, ferric chloride has a heavy pollution to the environment and is seldom used for mold etching.The latter because in the preparation of a large number of concentrated sulfuric acid, concentrated nitric acid, etc., in the preparation of special care, this formula for the mold pattern etching speed, etching effect is good and is widely used;However, the etching speed of some high alloy steel is slow and the surface is easy to passivate.In the selection, it is advisable to adopt the triacid system for ordinary die steel, and the ferric chloride system for high alloy steel.In addition to the two commonly used etching systems, there are sulfuric acid - hydrogen peroxide system, nitric acid - monophosphoric acid system.For insoluble metals, a water etching solution is also used.

4. Selection of aluminum and alloy etching system

The etching system of aluminum alloy has acid and alkali, acid etching system is more use of ferric chloride, hydrochloric acid, also use phosphoric acid fluoride system.Among them, ferric chloride etching system is commonly used.The etching quality of alkaline etching is better than that of ferric chloride, and the etching cost is low, which is a better etching method. However, the production cost of corrosion prevention layer of alkaline etching is higher than that of acid etching, which is the bottleneck restricting the extensive promotion and application of alkaline etching at present.

5. Selection of titanium alloy etching system

Titanium alloy can only be etched in fluoride system, but it is easy to produce hydrogen embrittleness in the etching of titanium alloy. In practical applications, hydrofluoric acid and nitric acid or a mixture of hydrofluoric acid and chromium liquor are used, and the etching system composed of fluoride with low acidity and hydrogen peroxide can also be used.

Above, a brief introduction is given to the selection of commonly used metal etching solution. The principle of selection is to meet the design requirements, at the same time to make the cost reasonable and management more convenient.

Nantong zhuolida choose different etching solutions for different metals, etching product quality is trustworthy, is your choice of etching factory important partners!