What Is Etching

What is Etching Process

Etching, also known as Photo Chemical Etching (PCM), It is a technology that removes materials, Such as stainless steel, copper alloy, aluminum alloy, nickel alloy, titanium, nickel nickel and so on, using chemical reactions, by exposure and development processes the pattern of the product are transferred onto the metal sheet or substrate plate, and then the product area would be protected by etchant resist, while the unwanted area the etchant resist would be removed and leave the metal sheet or substrate plate uncovered, when the chemical solution meet the metal sheet or substrate corrosion take happen, forming a concave-convex, half-engraved or through cut shape effect. At first etching is used on printing embossing plate and PCB manufacturing industries, after a long-time improvement and development of etching equipment and technology, now it has been widely used in aviation, machinery, chemistry, medical industries, especially in the fields of semiconductor manufacturing, chip processing, and ultra-thin electronic sheet parts, precision etching is an indispensable technology.

Etching Process Flow Chart

Etching can be divided into two types: wet etching and dry etching.

1.     Dry etching:

Drawing Engineering → Material Preparation and Cutting → Material Cleaning → Drying → Etchant Resist Coating → Exposure → Development → Baking → Spot Filling → Etching → Stripping → Product.

2.     Wet etching: