What is Anodizing?
Knowledge

What is Anodizing?

Anodizing is a treatment used to enhance the surface properties of metals. It can improve the appearance, durability, conductivity or other properties of a metal surface and help protect it from wear and corrosion. In addition, it can also be used to make different shaped materials, such as rubber rings, pressure-type parts or trimming cutting tools. Therefore, anodizing is a common metalworking method.
Published: Jan 06, 2023
What is Anodizing?

Purpose and Application of Anodizing Treatment

Generally, aluminum alloys are easily oxidized in the air. Although the natural oxide layer has a certain passivation effect, as a result of long-term exposure, the oxide layer will still be damaged and peeled off, losing its protective effect.

Therefore, the purpose of anodic oxidation treatment is to use its easy-to-oxidize characteristics to quantitatively form an oxide layer on the surface of the product by electrochemical methods to prevent further natural oxidation of the aluminum material and increase the mechanical properties (functionality) of the surface; another purpose is, through different back-end reactions, various colors are produced to enhance the appearance (decorative).

Aluminum alloy anode treatment is widely used in aerospace, military weapons, electronic digital, auto parts, precision machinery equipment, semiconductor industry, optoelectronic industry, construction industry, aluminum doors and windows, etc.

Anodizing Overview

Metal anode treatment is metal in the electrolytic solution, with the treated part as the anode, and the corrosion-resistant material as the cathode, through the electrochemical treatment method to generate wear-resistant, corrosion-resistant and other functional or decorative components on the metal surface. The process of transforming the film layer.

Anodizing objects can be aluminum and aluminum alloys, magnesium alloys, titanium and titanium alloys, etc. The most widely used and fastest growing in the market is anodizing of aluminum and aluminum alloys.

Natural hard anodizing

Aluminum anodizing is a processing method that allows the color to penetrate into the inner layer of the object. The process is to place the aluminum or aluminum alloy workpiece on the anode in the electrolytic bath, and apply a certain voltage and current to promote the formation of a well-adhesive oxide layer on the surface of the workpiece. Because aluminum alloys are easy to oxidize, although the oxide layer has a certain passivation effect, the oxide layer will still peel off and lose its protective effect after long-term exposure. Therefore, the purpose of anodizing is to use its easy-to-oxidize characteristics to control oxidation by electrochemical methods. The formation of a layer to prevent further oxidation of the aluminum, while increasing the mechanical properties of the surface, such as increasing the hardness.

Applicable: mechanical assembly applications, automobile and locomotive industries, ship parts, aerospace industry, food equipment, biotechnology, medical equipment, optoelectronics, and semiconductor industries.

Black hard anodizing

Different chemical reactions produce various colors to enhance the appearance.

Applicable: optoelectronic semiconductor industry, mechanical assembly application, aerospace industry, biotechnology, automobile and motorcycle industry, ship workpiece, food equipment, medical instrument.

Natural anodizing

Applicable: optoelectronic semiconductor industry, mechanical assembly application, aerospace industry, biotechnology, automobile and motorcycle industry, ship workpiece, food equipment, medical instrument.

Black anodizing

Different chemical reactions produce various colors to enhance the appearance.

Applicable: optoelectronic semiconductor industry, mechanical assembly application, aerospace industry, biotechnology, automobile and motorcycle industry, ship workpiece, food equipment, medical instrument.

Chromates

Different chemical reactions produce various colors to enhance the appearance.

Applicable: mechanical assembly application, aerospace industry.

Characteristics of Aluminum Alloy Anodizing

General anodic treatment can also be called "decorative anodic treatment". Its characteristic is that it can form a bright and corrosion-resistant surface on the surface of aluminum, and can choose bright surface treatment or matte surface treatment (pear surface) according to customer's preference. Because the formed surface is porous and has excellent permeability, the surface can be soaked or sublimated with organic or inorganic dyes to make it penetrate into the capillary pores to form finished products with various colors and patterns. And the color comes with various changes, which is the characteristic of general anodic treatment.

Published by Jan 06, 2023 Source :AppliChem, Source :HWAGUO, Source :YO FONG

Further reading

You might also be interested in ...

Headline
Knowledge
What is an Oscilloscope?
An oscilloscope is a diagnostic instrument that graphs electrical signals. Whether it is a simple or complex product, it includes electronic components, and its design, verification, and the debugging process require an oscilloscope to analyze the many electrical signals that make the product wake up.
Headline
Knowledge
What is Heat-assisted Magnetic Technology?
Heat-Assisted Magnetic Recording (HAMR) is a technology that uses laser heat to first heat highly stable media to assist in the magnetic recording of data.
Headline
Knowledge
Key Components of Automotive Semiconductors: ECU, MCU and Sensor
The automotive semiconductor market continues to be optimistic. At present, the main automotive semiconductor chips include microcontrollers (MCU), power management ICs, digital signal controllers (DSP), sensors, power semiconductors, discrete components, micro-electromechanical (MEMS), memory, customized application IC (ASIC), etc. The automotive chip supply chain is complex and long. After the shortage storm in 2021, automakers began to shorten the semiconductor supply chain, hoping to shorten the long chain. Some automakers even have the idea of developing and designing automotive semiconductors by themselves.
Headline
Knowledge
What is Sheet Metal Processing?
"Sheet metal" in sheet metal processing refers to thin metal plates, which can be processed by stretching, stamping, bending, etc., and the thickness is usually less than 6mm. Common materials include iron plates (black steel SPHC, cold-rolled steel SPCC, galvanized steel SECC), hot-dip galvanized steel sheet SGCC), stainless steel (SUS304, SUS316), aluminum (AL5052), copper, etc. Sheet metal processing is different from other processing technologies. It includes many different steps, such as: laser cutting, NCT punching, cutting, folding, welding, riveting, etc. The specific products produced are usually support frames, equipment covers, internal parts and some functional objects, such as electronic control panels, medical equipment covers, airport automatic clearance machine covers or parts, snapshot cabinets, food processing equipment covers and parts.
Headline
Knowledge
What is an Industrial Cooler?
A cooler is a device used for cooling during the manufacturing process.
Headline
Knowledge
How to Choose a Suitable Uninterruptible Power Supply System?
Uninterruptible Power Supply (UPS) is a device that continuously provides backup AC power for electrical load devices and maintains the normal operation of electrical appliances when the power grid is abnormal. Uninterruptible power supply systems can be divided into online, offline, and line interactive. The power requirements of each field are different. How to choose a suitable one?
Headline
Knowledge
What is A Punch? Punch Principle, Type, Material Introduction
Punching machine, also known as stamping machine, is a forming process technology. There are many types of it. Due to different structural principles, the price and processing effect will be different accordingly, but they all have something in common in terms of structural composition. With the rapid development of the stamping industry, competition in all walks of life is increasing, and it is applied to various industries, such as aerospace, education, auto parts, diving equipment and so on. The following will introduce the punch structure, type and material.
Headline
Knowledge
Introduction to the Different Types of Welding
Welding is a manufacturing process and technology that uses heat, high temperature or high pressure to join metal or other thermoplastic materials such as plastics. According to the state of the metal in the welding process and the characteristics of the process, the welding methods can be divided into three categories: welding, pressure welding and braze welding.
Headline
Knowledge
What is Worm Gear?
A worm gear is a gear consisting of a shaft with a helical thread that meshes with and drives the gear.
Headline
Knowledge
What is Chip Formation?
In the chip formation process, materials are cut through mechanical means by using tools like milling cutters, saws, and lathes. It is an integral part of the engineering of developing machines and cutting tools.
Headline
Knowledge
What Exactly is a Boring Machine?
A boring machine, device for producing smooth and accurate holes in a workpiece by enlarging existing holes with a bore. A single-point tool is attached to a rotating spindle within a boring head. They can dig through anything from hard rock, soft soil to sand.
Headline
Knowledge
What is About Die Casting?
Die casting is a manufacturing process in which molten metal is injected into a mold cavity under high pressure and then cooled to form a part. It is often used for producing parts with complex shapes, intricate details, and thin walls. Die cast parts are usually made from metals such as aluminum, zinc, copper alloys, magnesium, lead or tin-based alloys.
Agree