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Aluminum Alloy
Dingang
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Next-generation supercomputing clusters, accelerator nodes, and enterprise servers dissipate extreme heat flux across dense CPU and GPU vapor chamber heat sinks. These forced-convection heat sink assemblies utilize stacks of dozens to hundreds of tightly spaced, ultra-thin aluminum fins (often 0.15mm to 0.30mm thick) interlaced with copper heat pipes. In high-velocity air-cooling streams, bare aluminum fins face constant airborne micro-contaminants, including industrial sulfur compounds, ambient humidity, and trace corrosive particulates pulled through intake fan walls. Over extended runtime, bare fins develop localized pitting and white-rust oxidation. This corrosion roughs up air-passage walls, raises static airflow resistance, and sheds conductive oxide dust directly onto high-density printed circuit boards.
Our Corrosion-Resistant Epoxy Coated 8011 Aluminum Strip solves these degradation and stamping bottlenecks at the raw coil stage. Manufactured from fine-grain AA8011 continuous-cast alloy (in H22 or H24 tempers), the strip is roller-coated with a specialized micro-thin thermoset epoxy barrier system (2.0 to 4.5 µm total dry film thickness). Unlike heavy paints that act as thermal insulators, this ultra-thin epoxy layer protects against environmental acid/moisture attack without degrading metal-to-pipe thermal conduction. With certified 500-hour neutral salt-spray resistance, excellent ductility for micro-louver slicing and high-collar pipe expansion, and clean punch shear characteristics, this material feeds directly into high-speed progressive fin presses running at over 300 strokes per minute.
Supercomputing heat sink production requires thin metal stock that balances environmental corrosion protection, high thermal conduction, and high-speed stamping ductility. Our Corrosion-Resistant Epoxy Coated 8011 Aluminum Strip utilizes a specialized micro-thin thermoset epoxy system designed specifically for electronic cooling assemblies. Because the coating is applied via high-precision reverse roller coaters to an ultra-thin 2.0 to 4.5 µm profile, it establishes an airtight moisture barrier without introducing the thermal resistance typical of standard 25-micron paints. In progressive stamping dies, the balanced iron and silicon grain distribution of AA8011 allows high-speed piercing of delicate louver blades and deep drawing of heat-pipe collar rings without edge tearing or orange-peel wrinkling. The crosslinked epoxy remains firmly bonded to the aluminum lattice during mechanical tube expansion, ensuring tight metal-to-metal thermal contact with copper heat pipes. Supplying slit strip directly to high-speed fin lines eliminates the downtime and part scrap caused by die clogging, keeping fin manufacturing lines running smoothly.
Ultra-Low Interfacial Thermal Resistance: Micro-thin 2.0 to 4.5 µm coating profile allows fast heat transfer from copper heat pipes into the fin array without thermal choking.
Flake-Free High-Collar Stamping: High elongation (≥ 18%) ensures smooth collar draws and sharp louver slitting at over 300 strokes per minute without paint dusting.
Over 500 Hours Salt-Spray Barrier: Thermoset epoxy seals against moisture and airborne pollutants, preventing oxidation and fin degradation in high-airflow server chassis.
Thermal Endurance up to 150°C: Resists thermal degradation during continuous high-temperature server operation and heat-pipe solder reflow processes.
Elimination of Airborne Oxide Particles: Prevents the formation and shedding of conductive aluminum oxide dust, protecting underlying motherboards and high-speed PCIe circuits.
Parameter | Detailed Information |
|---|---|
Main Product | Brushed Surface Color Coated Aluminum Coil |
Optional Alloys | 1050, 1060, 1100, 3003, 3004, 3105, 5052, 5005, 5754, 5083, 6061, 8011 |
Available Tempers | O, H12, H14, H16, H18, H24, H26, H32, H34 |
Thickness Range | 0.009 mm – 1.6 mm |
Width Range | 30 mm – 1600 mm |
Inner Core Diameter | 76mm,150 mm, 405 mm, 505 mm |
Color Customization | RAL color system, Pantone color system, custom colors per samples |
Coating Thickness | PVDF coating ≥25 μm; PE coating ≥18 μm |
Standard Packaging | Export-grade wooden pallets (Eye to Wall / Eye to Sky loading modes) |
Minimum Order Quantity | 3 metric tons per specification |
Delivery Cycle | 30 – 45 working days |
Loading Ports | Shanghai, Ningbo, Qingdao, Tianjin and other major ports |
Payment Terms | 30% T/T deposit in advance, 70% balance against B/L copy; L/C at sight |
Precise heat transfer and clean stamping in supercomputing heat sinks require tight control over base alloy grain structure, thin-film coating thickness, and collar-drawing performance.
Using mirror-polished tungsten carbide rotary knives, master coils are slit into narrow strips down to 30mm with width tolerances held to ±0.08mm. Knife clearances and penetration depths are calibrated to the shear behavior of AA8011-H22, suppressing edge burrs below 0.008mm. This clean cut prevents fin jamming and extends tool life in progressive high-speed dies.
Our epoxy coating is formulated to work with standard fast-evaporating fin-stamping lubricants (vanishing oils). The chemical crosslinking prevents the coating from softening, swelling, or leaving sticky residues when exposed to solvent-based lubricants, allowing finished stamped fins to air-dry clean without requiring post-wash degreasing.
To support continuous stamping lines and minimize coil changeovers, we supply slit strip in continuous traverse-wound spools (oscillation wound) up to 800kg. Spools feature zero-splice joints and controlled winding tension, allowing progressive fin presses to run for full shifts without stopping for coil changeovers.
Finished slit coils and spools are packed on reinforced, fumigated wooden pallets in eye-to-sky orientation. Each coil is inter-layered with non-abrasive protective discs, sealed inside heavy-gauge vapor corrosion inhibitor (VCI) bags with desiccants, and enclosed in steel-strapped wooden crates to prevent edge damage and moisture condensation during ocean transit.
Modern 600W+ AI accelerator cards use dense fin arrays soldered directly to nickel-plated vapor chamber bases. Stamped from 0.20mm to 0.25mm 8011 epoxy coated strip, these tightly spaced fins (1.0mm to 1.2mm pitch) maintain open airflow under high-pressure blower fans. The micro-thin coating prevents fin oxidation in hot server air exhaust, while clean-sheared edges maintain straight air channels that prevent localized thermal throttling.
Dual-tower CPU coolers for workstation processors route 6 to 8 sintered copper heat pipes through hundreds of stacked aluminum fins. Stamped with precision drawn collars from 0.25mm to 0.30mm coated strip, each fin slides over copper pipes during automated stacking. The flexible epoxy lining stretches during mechanical pipe expansion, maintaining tight thermal contact with the pipe surface without cracking along collar seams.
Low-profile 1U server node heat sinks rely on micro-skived or stamped louvered fins to extract heat in limited vertical space. Punch-formed from 0.15mm to 0.20mm 8011 coated strip, these fins feature multidirectional air louvers that break up thermal boundary layers. The epoxy coating prevents corrosion from humid intake air, keeping fin surfaces clean and maintaining steady aerodynamic performance over multi-year deployments.
Edge computing servers mounted on outdoor cell towers face humid, high-salinity air. Heat sinks fabricated from 8011 epoxy coated fin stock resist atmospheric chloride attack without needing heavy protective housings. The coating prevents pitting corrosion on fin edges, maintaining cooling efficiency in fluctuating outdoor conditions.
Server power supply units (PSUs) and DC-DC step-down converters generate concentrated heat around power MOSFETs and planar transformers. Folded and stacked fins stamped from 8011 coated strip provide compact, lightweight cooling arrays. The epoxy finish provides localized electrical insulation against transient surface arcs, protecting low-voltage control circuits during high-amperage power spikes.
Q1:Why is an ultra-thin 2.0 to 4.5 µm epoxy coating critical for supercomputing heat sinks?
Standard industrial coatings typically have dry film thicknesses of 20 to 30 microns, which act as thermal insulation and degrade heat transfer between the heat pipe and the fin stack. By using precision reverse roller coaters to apply a micro-thin 2.0 to 4.5 µm layer, our strip provides reliable corrosion protection while keeping interfacial thermal resistance low enough for high-wattage computing hardware.
AA1100 has lower mechanical strength and can tear during high-collar drawing operations. AA3003 provides high strength but its coarser manganese grain structure can cause edge cracking in thin-gauge louver punches. AA8011 contains balanced iron and silicon additions that create a fine, uniform grain structure. In 0.15mm to 0.30mm gauges, it provides the ductility needed to draw tall collars and punch fine louvers without tearing.
For 0.20mm to 0.30mm AA8011-H22 coated strip running on high-speed presses (250–350 SPM), we recommend a punch-to-die total clearance of 6% to 8% of metal thickness per side. Maintaining sharp tooling and proper die clearances prevents coating drag, minimizes edge burrs, and avoids paint dust buildup in tight collar-forming cavities.
Yes. The crosslinked thermoset epoxy resin remains stable during short-term thermal exposures up to 260°C, making it compatible with lead-free soldering and reflow processes used to bond heat pipes to aluminum fins. The coating will not char, blister, or outgas volatile vapors during typical heating cycles.
Yes. While this product is optimized with a corrosion-resistant epoxy barrier for dry heat sinks, we also supply AA8011 strip with dual-layer hydrophilic coatings (water contact angle ≤ 10°) for applications involving condensation, such as heat pump coils and closed-loop data center air handlers.
Are you fabricating supercomputing heat sinks, engineering high-density GPU cooling arrays, or seeking to replace bare aluminum foil to eliminate fin oxidation?
Contact our technical sales engineering team today to review your heat sink fin strip specifications and receive a factory-direct quotation within 12 hours.
