The action of washing during metal etching

Function of washing

Washing is one of the most commonly used steps in the whole process of metal etching.The purpose of washing: to wash away from the alkaline or acidic solution of the workpiece surface attached to the alkaline or acidic liquid film instead of a clean water film, so as to become a clean surface;When the workpiece is transferred from a process to the next process, it is not necessary to take the solution of the previous process to the solution of the next process.Therefore, washing is an important process in the whole process of metal etching.

In terms of process layout, washing follows the main working tank, such as chemical deoiling followed by multistage washing tank, as well as other processes.For a whole set of etching process is completed by multiple chemical treatment processes, if it is not appropriate to design its own multistage water washing tank behind each chemical treatment tank (except for fully automatic production line), the working area will become larger, equipment investment will increase, and production efficiency will decline.In this case, according to the actual situation, some washing tanks can be combined, that is, multiple processes share a set of washing system.However, there should be an independent washing tank outside the working tank of the process as a primary washing, the basic premise of doing so is that the washing water in the respective washing block can be used to supplement the evaporation of the solution in the working tank, and also make the influence of the different chemical composition between the working tanks on the product quality to be very low.

Water washing can be divided into room temperature water cleaning and hot water cleaning according to its temperature range.For cleaning, most of them use room temperature water cleaning, because this method does not need heating, low energy consumption, easy to use, and no special requirements for the washing tank.Hot water washing is generally carried out under the condition of about 60℃, hot water washing is very effective for the washing of the workpiece after alkaline treatment, the hot water environment is conducive to the diffusion of alkali film on the surface of the workpiece in water and conducive to cleaning, so in the alkaline oil removal or alkali corrosion after the use of hot water washing, and then with normal temperature washing cleaning effect will be better.If it is after acid treatment, it should not be washed with hot water first, but should be washed with room temperature and then with hot water.Hot water washing requires a thermal insulation device for the washing tank, and its production cost is higher than normal temperature washing.

According to the washing method of the workpiece in water, it can be divided into immersion washing and spray washing. Immersion washing is widely used in actual production, while spray washing is seldom used due to its high equipment investment.

Water washing can be divided into ordinary water washing and deionized water washing according to the nature of water.The former is used by the common method of filtering tap water washing, in metal etching process is a kind of washing solution USES morer, but this approach is not suitable for precision workpieces or strict in surface of workpiece, because using common filtering methods still exist a variety of corrosive anions of clean water, especially the presence of chloride ion surface causes the watermark or corrosion, etc.;The latter is the use of high purity water after the removal of impurities in the water, this water does not contain grasping ions and other corrosive anions, for the precision of the workpiece and surface requirements of the strict workpiece cleaning with deionized water is very necessary, but the production cost of this water is high, in the actual production will rarely be so used.But a compromise method, which is often used for demanding products, can be used: first wash with clean water and then clean with deionized water.Deionized water is recommended for all required workpieces after processing and during cleaning.

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