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Alternative Advantages of Laser Cleaning to Metal Pickling(1)

May 09,2023 | TOPTEK

Alternative Advantages of Laser Cleaning to Metal Pickling (divided into two explanations of 1 and 2, this is 1)

The main advantages of pickling boards are:
1. The surface quality is good, because the hot-rolled pickled plate removes the surface scale, improves the surface quality of the steel, and is convenient for welding, oiling and painting.
2. The dimensional accuracy is high, and the shape of the plate can be changed to a certain extent after step-by-step adjustment to reduce the deviation of unevenness.
3. Improve the surface finish and enhance the appearance effect.

Pickling boards are widely used:
It can be said that the pickling plate is a cost-effective product between cold-rolled plate and hot-rolled plate. Widely used in automobile industry, machinery industry, light industrial appliances and stamping parts of various shapes, such as girders, sub-beam spokes, carriage panels, fans, chemical oil drums, welded pipes, electrical cabinets, fences, iron ladders, etc. market expectation. wheel marriage,
Below we will introduce the process flow of the pickling process and the alternative advantages of laser cleaning.

Metal pickling process
①Pickling principle:
It is a surface treatment that uses an acid solution to remove scale and rust from the surface of steel, usually with a pre-coat. Generally, the workpiece is immersed in a chemical solution such as sulfuric acid to remove oxide and other films on the metal surface, which is the pretreatment or intermediate treatment of electroplating, enamel, rolling and other processes. Also known as wet cleaning.
Most of the acids used are sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid and mixed acids.
Laser cleaning principle:
Using laser energy to penetrate the surface of the object, the electrons in the substance absorb energy and move within about 100 seconds, generating plasma on the surface of the substance; after 7-10 picoseconds, the electron energy is transmitted to Kungel, making the lattice start to vibrate, After 10 picoseconds, the object begins to generate a macroscopic temperature, and the local material irradiated by the laser begins to heat up, melt, and vaporize, thereby achieving the purpose of cleaning.

②Process flow:
Hanging on the metal parts - chemical degreasing (conventional alkaline chemical degreasing or surfactant degreasing) - hot water washing, first water washing - first pickling, first water washing - second pickling, first water washing - —Transfer to the next process (such as: chemical coloring)-recycling, first-level washing-hardening treatment, first-level washing, sealing treatment, first-level washing-drying finished product)
Laser cleaning process and effect:
Compared with the pickling method, the laser cleaning process is very simple, does not require pretreatment, and can perform cleaning tasks such as oil removal, oxide layer removal, and rust removal at the same time. Just turn on the unit to let the lights go off, then clean.
Laser cleaning can reach the highest level of Sa3 level industrial cleaning, with little damage to the hardness, hydrophilicity and hydrophobicity of the material surface. More thorough than pickling.