Aluminum nuts yellow oxide

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

• Made from aluminum (common grades: 6061, 2024, or 7075 for strength and lightweight properties).

2. Yellow Oxidation Process

Anodized Yellow

• Anodizing Type II (Sulfuric Acid Anodizing) – Creates a porous oxide layer, which is then dyed yellow before sealing.

• Hard Anodizing (Type III) – Produces a thicker, more wear-resistant layer, sometimes with a gold-like yellow hue.

• Electrolytic Coloring – Uses metallic salts (e.g., ferric ammonium oxalate) to produce a yellowish-bronze tone.

Chemical Conversion Coating (Alodine/Iridite)

• A cheaper alternative to anodizing, producing a gold-yellow chromate layer (common in military/aerospace specs like MIL-DTL-5541).

• Provides moderate corrosion resistance and improves paint adhesion.

3. Features & Benefits

• 耐腐蝕性 – Protects against oxidation and harsh environments.

• Aesthetic & Identification – Bright yellow for color-coding or decorative uses.

• Electrical Conductivity – Chromate coatings retain conductivity; anodizing does not.

• Lightweight – Ideal for applications where weight matters (e.g., aerospace, drones).

4. Common Applications

• Aerospace & Defense – Yellow-chromated nuts for corrosion resistance (e.g., aircraft panels).

• Electronics – Color-coded fasteners in PCBs or machinery.

• Automotive & Bicycles – Custom/high-visibility components.

• Marine Hardware – Saltwater-resistant yellow coatings.

5. Variations in Yellow Finish

• Bright Yellow – Dyed anodizing for vibrant colors.

• Gold-Yellow – Chromate conversion coating (common in MIL specs).

• Matte or Glossy – Surface finish depends on pre-treatment (e.g., etching, polishing).

6. Limitations

• Anodized Yellow – Less UV-stable; may fade over time unless sealed properly.

• Chromate Yellow – Contains hexavalent chromium (restricted in some regions; alternatives like trivalent chromate exist).

• Not for High-Stress Use – Aluminum nuts are weaker than steel in heavy-load scenarios.