A Comprehensive Guide to Color-Coated Aluminum-Zinc Corrugated Sheets: Grades and Applications

As an upgraded choice for modern building envelope materials, color-coated aluminum-zinc corrugated sheet is widely used in industrial plants, logistics warehouses, and commercial buildings due to its excellent corrosion resistance, superior heat reflection performance, and aesthetic and durable characteristics. This article provides an in-depth analysis of the grade system of color-coated aluminum-zinc corrugated sheet and offers comprehensive selection and application guidance to help you make the most suitable material choice.

I. Core Advantages of Aluminum-Zinc Substrate

1. Material Composition and Protection Mechanism The substrate of color-coated aluminum-zinc corrugated sheet is made of aluminum-zinc coated steel sheet, and its coating composition is typically 55% aluminum, 43.5% zinc, and 1.5% silicon. This unique alloy combination forms a multi-layered protective structure:

Top aluminum layer: Provides excellent resistance to atmospheric corrosion, forming a dense alumina protective film.

Middle alloy layer: An aluminum-zinc alloy layer, combining the corrosion resistance of aluminum with the cathodic protection function of zinc.

Bottom pure zinc layer: Provides sacrificial anodic protection against steel plate cuts and scratches.

2. Performance Comparison Advantages

Compared with traditional galvanized steel sheets, aluminized zinc sheets have significant advantages: excellent corrosion resistance, heat resistance (no discoloration at 315℃), and heat reflectivity of 75%-80%.

II. Comprehensive Explanation of the Grade System

1. Substrate Material Grade Identification

The grade designation of aluminized zinc-plated substrates follows the international standard system:

AZ Series Grade Meanings:

AZ150: Double-sided coating weight 150g/m² (per square meter)

AZ180: Double-sided coating weight 180g/m²

AZ200: Double-sided coating weight 200g/m² (heavy-duty anti-corrosion type)Commonly Used Grades in China:

SGLD: Standard grade for hot-dip aluminized zinc-plated steel sheets and strips

DX53D+AZ: European standard system, numbers indicate substrate type

III. Corrugated Board Models and Structural Characteristics

1. Common roofing sheet Model Parameters

750 type; 840 type; 860 type; 900 type; 1000 type;

IV. Application Scenarios and Selection Strategies

1. Industrial Plant Sector

Selection Points:

General Production Plants: AZ150 HDP Coating 840 type 0.5mm

Chemical and Electroplating Plants: AZ180 PVDF Coating 860 type 0.6mm High-Temperature Workshop: AZ150 SMP Coating (Heat-Resistant) Type 900 0.6mm

Advantages:

Corrosion resistance to industrial atmospheres

Heat reflection reduces workshop temperature

Lifespan reduces maintenance costs

Color-coated aluminum-zinc corrugated sheets, with their excellent comprehensive performance, have become one of the preferred materials for modern building envelopes. Correctly understanding the meaning of grade designations and scientifically selecting the appropriate type based on specific application scenarios can not only ensure building quality and service life but also achieve optimal economic benefits. With the continuous advancement of material technology, color-coated aluminum-zinc corrugated sheets will demonstrate their value in more fields, providing the construction industry with higher-quality, more environmentally friendly, and more durable solutions.