SGCC 2.5*1250MM Coil Galvanized Zinc 80G GB/T 2518 Phosphating Treatment Regular

Product Specification

Description

SGCC 2.5*1250MM Zinc 80G GB/T 2518 Phosphating Treatment Regular Spangle

GB/T 2518 is a Chinese national standard that specifies the technical requirements for continuously hot-dip zinc-coated steel sheets and coils. The term "Phosphating Treatment Regular Spangle" refers to a specific type of surface treatment and appearance of the galvanized steel.

Phosphating treatment is a pre-treatment process applied to the surface of galvanized steel sheets and coils. It involves the application of a phosphate conversion coating, typically using phosphoric acid or phosphate salts. The phosphating treatment enhances the adhesion of subsequent coatings or paints, improves corrosion resistance, and promotes better paint adhesion.

Regular spangle refers to a specific crystalline pattern that forms on the surface of galvanized steel during the hot-dip galvanizing process. It appears as a visually distinct pattern of small, regular-shaped crystals. Regular spangle is a desirable feature for many applications as it provides an aesthetically appealing appearance.

In the context of GB/T 2518, "Phosphating Treatment Regular Spangle" indicates that the galvanized steel sheets or coils have undergone a phosphating treatment to enhance their surface properties, such as paint adhesion and corrosion resistance. Additionally, the steel exhibits a regular spangle pattern, which contributes to its visual appearance.

Parameters

Main Features

Phosphating treatment is a surface treatment applied to galvanized steel to enhance its performance and provide specific features. Here are the main features and benefits of phosphating treatment on galvanized steel:

1. Improved Corrosion Resistance: Phosphating treatment forms a thin and tightly adhering phosphate conversion coating on the surface of galvanized steel. This coating acts as a protective barrier, enhancing the corrosion resistance of the steel. It helps prevent the formation and spread of rust, increasing the lifespan of the galvanized steel.

2. Enhanced Paint Adhesion: The phosphate conversion coating created during the phosphating treatment provides a rough and porous surface. This surface promotes excellent adhesion of subsequent coatings, such as paints or powder coatings. It improves the bonding strength between the galvanized steel and the paint, resulting in improved durability and aesthetics of the finished product.

3. Increased Lubricity: Phosphating treatment can improve the lubricity or slipperiness of the galvanized steel surface. This feature is particularly valuable in applications where the steel will undergo sliding or rubbing motions, such as in automotive components or machinery parts. The improved lubricity reduces friction and wear, improving the overall performance and longevity of the steel.

4. Enhanced Weldability: Phosphating treatment can improve the weldability of galvanized steel. By removing surface contaminants and creating a clean and reactive surface, it facilitates better fusion and bonding during welding processes. This ensures high-quality weld joints and reduces the risk of defects or failures.

Application

1. Automotive Industry: Phosphating treatment is extensively used in the automotive industry for galvanized steel components. It provides improved corrosion resistance and paint adhesion, making it suitable for various automotive parts such as chassis components, body panels, brackets, fasteners, and exhaust systems.

2. Construction and Building: Galvanized steel with phosphating treatment is used in construction applications where durability and corrosion resistance are essential. It is employed in roofing, cladding, structural beams, fasteners, and other components that require protection against harsh environmental conditions.

3. Electrical and Electronics: Phosphating treatment is beneficial for galvanized steel used in electrical enclosures, switchgear cabinets, and other electrical components. It enhances corrosion resistance and provides a suitable surface for subsequent painting or powder coating.

FAQ

Q1: What is phosphating treatment on galvanized steel?

A1: Phosphating treatment is a surface treatment process applied to galvanized steel to improve its corrosion resistance, enhance paint adhesion, increase lubricity, and provide other beneficial properties.

Q2: How does phosphating treatment improve corrosion resistance?

A2: Phosphating treatment forms a phosphate conversion coating on the surface of galvanized steel, which acts as a protective barrier against corrosion. The coating helps prevent rust formation and slows down the spread of corrosion.

Q3: In which industries is phosphating treatment on galvanized steel commonly used?

A3: Phosphating treatment finds application in various industries, including automotive, construction, electrical and electronics, industrial equipment and machinery, appliances, transportation, and infrastructure.