How to calculate the etching time of chemical etching process

In the chemical etching process method, is the part or has done the graphic corrosion protection layer of parts placed in the corrosion solution for corrosion, and has been corroded until the metal thickness to meet the requirements of the depth of the graphic to meet the requirements. The entire etching process, there are three variables, namely, etching depth, etching speed, etching time. The relationship between the three formulas are as follows: V = h / t where: V for the metal etching speed (mm / min), the chemical etching speed referred to here refers to the single-sided etching speed, h for the etching depth (mm); t for the etching time (min).

For the overall corrosion or molding chemical etching processing and hollowing graphic chemical etching are often in two sides at the same time for chemical etching, this double-sided chemical etching speed than only in a surface chemical etching speed 1 times faster. In the case of certain metal materials, affect the etching speed of many factors, the most important corrosive agent type, concentration and corrosion temperature. If the etchant concentration and etching conditions must be, the material properties and heat treatment status of the etching speed also has a great impact.

In order to determine the optimal chemical etching time, between chemical etching to be etched on the parts to be etched to determine the chemical etching speed of the material scheduled, especially after the addition of additives to the etching solution should be more so. Usually, a small sample of the same material to be etched (including material type, heat treatment status and thickness) is used to determine the etching rate. Samples in a thorough cleaning and accurate determination of its thickness, in the etching solution for etching, etching time is generally taken 10min, the longer the time, the more accurate etching speed.

In the calculated etching time, can complete the required amount of corrosion processing, in the whole etching process, the main need to control two aspects of the parameters to be guaranteed. First, the control of the concentration of the composition of the etching solution: this can be satisfied by the chemical analysis of the etching solution, and according to the results of the analysis to replenish the consumed corrosive agent. In order to prevent rapid changes in the composition of the corrosive agent, the preparation of corrosive fluid in the conditions permit (processing volume, corrosive fluid cost tolerance, the size of the corrosion site, etc.) will be corrosive fluid volume to do some big, so that it is not in the amount of corrosion and corrosion of not too large parts of corrosive processing, halfway through the analysis of the need to stop and replenish. Second, the control of the temperature of the etching fluid: temperature has a certain impact on the etching speed, in the limit of the etching speed range, when the temperature rises about 12 ℃, the etching speed increased by about 1 times, for parts with precise size requirements, the temperature does not exceed ± 2 ℃ ~ ± 3 ℃.