Specification for stainless steel etching process

Stainless steel etching process specification

(1) stainless steel etching process: pretreatment, corrosion prevention layer production a mounting - activation - etching - flow washing - photochemical treatment - flow washing - inspection - cleaning corrosion prevention layer - drying - hanging - inspection - transfer process (or packaging people's bank).

(2) the main process requirements are as follows.

①Pretreatment: according to the stainless steel pretreatment process specifications.

②corrosion prevention layer production: according to the technical specifications of the engraving method;Photosensitive process shall be carried out according to the process specification of photosensitive method;Silk screen printing process according to the standards of silk screen printing;Laser lithography is performed according to the laser lithography process specification.

③mounting: according to the different etching method to choose the appropriate mounting method.Mounting should be firm, to ensure that the workpiece does not adhere to each other, collision.Appropriate mounting position, try to avoid the generation of air bags in chemical treatment, to ensure the uniformity of etching.If the transmission etching equipment is used for etching, there is no need to mount, but appropriate tooling should be used to prevent the displacement of the workpiece during the injection and affect the etching.

④Activation is carried out according to table 4-9.

⑤Etching: graphic etching and spray etching according to table 4-10, immersion etching according to table 4-11.

For the vertical etching of the workpiece, the upper and lower positions should be changed regularly. During the etching process, attention should be paid to the change of etching depth. When etching to about 80% of the depth, the workpiece should be taken out to measure the depth, and then the remaining etching time should be determined.For the steps with low depth and graphic etching, the time can be determined according to the process test in advance.The multi-step etching should be carried out in several times, and the laser lithography method is recommended for the anti-corrosion layer of multi-step etching with low depth.Corrosion - proof layer is made by repeated etching and lithography.
⑥The photochemical processing was performed as shown in table 4-12.

⑦Inspection: this step is mainly to check the etch depth, etch surface effect is in line with the process requirements, and at the same time to check whether the corrosion layer is abnormal.
⑧Removal of anti-corrosion layer: the anti-corrosion layer made by silk screen printing, photosensitive or laser lithography can be cleaned with organic solvent and 5% to 10% sodium hydroxide solution.The anti-corrosion layer made by the engraving method can be directly stripped off. For the workpiece with small thickness, attention should be paid to prevent the deformation of the workpiece during the stripping process.
⑨Drying: drying in a drying oven (chamber) at 60℃ to 80℃.
⑩Unloading: clean spinning gloves should be worn when unloading, and operators should wear clean spinning gloves in each subsequent process. 
(3) solution preparation and adjustment are described below.
①Solution preparation method: omitted.
②The analysis items and analysis periods of solution components are shown in table 4-13.

(4) causes of common faults and troubleshooting methods are shown in table 4-14