How to do the pre-treatment work of the combination screw?

Update:12-11-2021
Summary:

Three points of attention for the pre-treatment process […]

Three points of attention for the pre-treatment process of composite screw spraying, what is composite screw spraying. Spraying is a coating method in which spray guns or disc atomizers are used to disperse into uniform and fine droplets by means of pressure or centrifugal force and apply to the surface of the object to be coated.

Hardware spraying process selection. Metal spraying can be divided into air spraying, airless spraying, electrostatic spraying and various derived methods of the above basic spraying forms, such as large flow and low pressure atomization spraying, thermal spraying, automatic spraying, multi-group spraying, etc. The spraying treatment method should be determined according to the use of different materials.


Conventional combination screw pretreatment before spraying. Degreasing and degreasing → water washing → pickling and rust removal → water washing → neutralization → water washing → surface conditioning → phosphating → water washing → drying → painting / electrostatic powder spraying (normal conditions for degreasing and oil removal, pickling and rust removal process every time The process must be greater than 25 minutes).

1: When there is no rusty workpiece, the processing flow is as follows. Pre-degreasing→degreasing→hot water washing→cold water washing→cold water washing→pre-table adjustment→table adjustment→phosphating→cold water washing→pure water washing (1)→pure water washing (2).

2: When there is a rusty workpiece, the processing flow is as follows. Pre-degreasing → degreasing → hot water washing → cold water washing → pickling → cold water washing → meter adjustment → phosphating → cold water washing → pure water washing (1) → pure water washing (2)