Dos chromized aluminium
DOS Chromized Aluminium is a specialized aluminum product enhanced through chromizing—a surface treatment process where chromium is diffused onto the aluminum surface to form a protective layer. This treatment significantly improves corrosion resistance, surface hardness, and durability, making DOS Chromized Aluminium highly valued in demanding industrial and architectural applications.
DOS Chromized Aluminium
Chromizing aluminum involves incorporating chromium into the substrate’s surface via chemical or mechanical means, often followed by heat treatment. The resulting surface features a chromium-rich film that drastically upgrades the aluminum's performance in harsh environments without compromising its innate lightweight and conductive properties. DOS stands for Durable Oxidation Surface, which relates to the stability and robustness of the chromized coating on aluminum.
This aluminum variant balances two essential aluminum attributes — lightweight composition and corrosion resistance — ideal for applications exposed to fluctuating weather conditions, aggressive media, and thermal stresses.
Functions of DOS Chromized Aluminium
Corrosion Resistance Enhancement: The chromium layer acts as a protective barrier, reducing the material's vulnerability to oxidation, particularly in marine or chemically aggressive atmospheres.
Wear Resistance: Increased surface hardness benefits components exposed to friction or abrasive wear, extending their operational life.
Thermal Resistance: Sustains performance in elevated temperature environments better than untreated aluminum.
Improved Adhesion for Coatings: Serves as a base layer, providing an improved bonding surface for additional finishing layers such as paints or adhesives.
Maintenance Reduction: Its durability decreases the frequency and costs of surface repairs and replacements.
Common Applications of DOS Chromized Aluminium
DOS Chromized Aluminium is favored in industries where high surface performance meets stringent operational demands:
Aerospace & Automotive: Parts subjected to erosion and oxidation such as heat exchangers, convoluted tubing, or structural elements.
Chemical Processing Equipment: Tanks, pipes, and containers exposed to low to moderate concentrations of corrosive chemicals.
Architecture and Construction: External facades, roofing, and panels where environmental resistance is critical but lightweight profiles remain necessary.
Electronics and Electrical Equipment: Components where wiring housings and cooling elements require protection and thermal effectiveness.
Heat Exchanger Tubes: Particularly in power plants and barracks requiring efficient heat transfer with superior durability.
Technical Details and Standards Compliance
The quality of DOS Chromized Aluminium is often confirmed by its conformity to national and international standards, regardless of its production source. Common technical specifications track mechanical properties, chemical composition, and processing conditions.
Chemical Composition of DOS Chromized Aluminium Alloy (Typical)
| Element | % Weight |
|---|---|
| Aluminum (Al) | Bal. (typically ≥ 99.0%) |
| Chromium (Cr) | 0.3 – 1.0 (Surface enrichment, varies by process) |
| Iron (Fe) | ≤ 0.7 |
| Silicon (Si) | ≤ 0.4 |
| Copper (Cu) | ≤ 0.1 |
| Manganese (Mn) | ≤ 0.1 |
| Zinc (Zn) | ≤ 0.1 |
| Others | ≤ 0.15 combined |
Note: Chromium content above refers mostly to the chromized surface layer concentration.
Technical Specifications and Parameters
| Parameter | Typical Value | Test Standard |
|---|---|---|
| Thickness of chromized layer | 20 to 40 microns | ASTM F649-17 |
| Tensile Strength | 90–250 MPa (depending on alloy & temper) | ASTM B209 |
| Surface Hardness (Vickers) | 350–450 HV (post chromizing) | ASTM E384 |
| Corrosion Resistance | >1000 hours no stain in salt spray test (ASTM B117) | ASTM B117 |
| Operating Temperature Range | −60 °C to 350 °C | Manufacturer dependent |
| Density | ≈2.71 g/cm³ | — |
Alloy and Temper Conditions
The underlying aluminum base for DOS chromized products commonly follows standard grades such as 3003, 3105, or 5005 due to their good corrosion resistance and fabrication ease. Typical temper designations include:
| Alloy | Temper | Description | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| 3003 | H14 (strain hardened) | Good workability graving moderate strength | 140 | 10 |
| 3105 | H22 (part-hard) | Good formability for coatings | 185 | 7 |
| 5005 | H34 (strain hardened) | Superior corrosion resistance, moderate strength | 215 | 6 |
Heat treatments after chromizing improve bonding strength and coating uniformity but are carefully regulated to maintain aluminum’s mechanical properties.
Implementation Standards and Quality Control
Producers of DOS Chromized Aluminium generally comply with the following guidelines and testing procedures for quality assurance:
- ASTM B209: Specification for Aluminum and Aluminum-Alloy Sheet and Plate
- RoHS and REACH Compliance: Environmental assurance for chromium emissions and heavy metal content
- ISO 9001 Quality Management: Applied during the manufacturing and coating processes
- Salt Spray Test (ASTM B117): To measure anti-corrosion properties
- Surface Layer Adhesion Tests: Including tape pull-off or scratch tests
Such standards guarantee that the products meet industrial benchmarks critical to their reliable application in the field.
DOS Chromized Aluminium stands out as a technologically advanced variation of aluminum sheets designed specifically for enhanced surface protection and durability. The combined benefits of light weight, toughness, remarkable corrosion resistance, and thermal endurance make it a top choice in aerospace, architecture, chemical industry, and electronics.
Its chromized surface layer acts as a proactive shield tackling oxidation and mechanical wear. Additionally, detailed standards and technical guidelines regulate its composition, production, and performance to fit rigorous use-cases.
When seeking aluminum sheets lasting longer under harsh environmental stress and improved service intervals, considering DOS Chromized Aluminium offers both economic and functional advantages.
For further technical consultation or to acquire DOS Chromized Aluminium tailored to your specifications, contact your trusted aluminum sheet supplier or manufacturer today.
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