螺栓與螺帽的鎖緊與開口採用非標準設計,搭配
使用非標準工具來解決打開和緊固問題。一般而言,其他
wrenches cannot be inserted. In the appearance design of nuts and bolts, non-standard slotting,
開口或五角、七角、九角或客製化對應槽工具
起到了很好的防盜效果
冷镦加工是一种少切削或无切削的压力加工新工艺
金屬。它是一種利用金屬在下列因素作用下產生塑性變形的加工方法
外力作用下,在模具的幫助下,重新分配和轉移金屬的體積,以形成
所需的零件或坯料。冷镦工艺最适合生产标准的
螺栓、螺絲、螺帽、鉚釘和銷等緊固件
An Aluminum nuts yellow oxide is a fastener that has been treated with a yellow-colored surface finish, typically through anodizing 或 chemical conversion coating, to enhance both its appearance and performance. Below is a detailed breakdown:
1. Material
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Made from aluminum (common grades: 6061, 2024, or 7075 for strength and lightweight properties).
2. Yellow Oxidation Process
Anodized Yellow
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Anodizing Type II (Sulfuric Acid Anodizing) – Creates a porous oxide layer, which is then dyed yellow before sealing.
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Hard Anodizing (Type III) – Produces a thicker, more wear-resistant layer, sometimes with a gold-like yellow hue.
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Electrolytic Coloring – Uses metallic salts (e.g., ferric ammonium oxalate) to produce a yellowish-bronze tone.
Chemical Conversion Coating (Alodine/Iridite)
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A cheaper alternative to anodizing, producing a gold-yellow chromate layer (common in military/aerospace specs like MIL-DTL-5541).
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Provides moderate corrosion resistance and improves paint adhesion.
3. Features & Benefits
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耐腐蝕性 – Protects against oxidation and harsh environments.
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Aesthetic & Identification – Bright yellow for color-coding or decorative uses.
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Electrical Conductivity – Chromate coatings retain conductivity; anodizing does not.
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Lightweight – Ideal for applications where weight matters (e.g., aerospace, drones).
4. Common Applications
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Aerospace & Defense – Yellow-chromated nuts for corrosion resistance (e.g., aircraft panels).
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Electronics – Color-coded fasteners in PCBs or machinery.
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Automotive & Bicycles – Custom/high-visibility components.
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Marine Hardware – Saltwater-resistant yellow coatings.
5. Variations in Yellow Finish
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Bright Yellow – Dyed anodizing for vibrant colors.
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Gold-Yellow – Chromate conversion coating (common in MIL specs).
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Matte or Glossy – Surface finish depends on pre-treatment (e.g., etching, polishing).
6. Limitations
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Anodized Yellow – Less UV-stable; may fade over time unless sealed properly.
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Chromate Yellow – Contains hexavalent chromium (restricted in some regions; alternatives like trivalent chromate exist).
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Not for High-Stress Use – Aluminum nuts are weaker than steel in heavy-load scenarios.
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