American Hose Clamp: There are two main types of American hose clamps: galvanized iron and stainless steel. The key difference lies in the design of the buckle, which is punched (also known as a "button" type). In the market, stainless steel clamps are more commonly used, especially in high-end applications like automotive parts due to their superior durability and appearance.
**First, the features of the hose clamp**
A hose clamp is a fastener used at the junction of soft and rigid pipes. It solves the problem of leakage that occurs when connecting small-diameter pipes with traditional clamps. This clamp uses an open inner and outer ring structure secured by bolts, making it effective in eliminating dead zones during connection and preventing liquid or gas leaks. Its simple design makes it easy to manufacture, reducing costs by about 30% compared to older models. It's widely used in vehicles, petrochemicals, pharmaceuticals, food processing, brewing, wastewater treatment, and dust removal systems.
**Second, the characteristics of the hose clamp**
The worm gear has low friction, making it ideal for high-end models or corrosion-resistant materials. It offers a wide range of applications, excellent resistance to torsion and pressure, balanced torque, secure locking, and a large adjustment range. It’s suitable for connections involving pipes of 30mm or larger, and provides an aesthetically pleasing finish after assembly.
**Third, the role of the American-style clamp**
As a fastener between soft and rigid pipes, the hose clamp effectively prevents leakage issues that were common in earlier designs. With its open ring structure and bolted fastening, it ensures a tight seal, even in difficult-to-reach areas. Its cost-effective and durable design makes it popular across various industries.
**Fourth, the fastener technology of the hose clamp**
**Improving Corrosion Resistance of Phosphated Fasteners**
1. **Problems**
According to GB11376-1989, the phosphating film showed no rust after 90 minutes of neutral salt spray testing. However, fasteners had a 45% failure rate, with uneven color, coarse crystals, and excessive ash.
2. **Influencing factors**
- **Solution composition:** Poor distribution ratios lead to coarse crystals and excessive ash. Black phosphating solutions often produce sediment, requiring daily cleaning.
- **Pre-phosphorization treatment:** Small fasteners packed together may not be fully phosphated, leading to weak corrosion resistance.
- **Temperature:** Higher temperatures improve bonding strength and hardness but can cause Fe²+ oxidation and solution instability.
- **Acid ratio:** Incorrect free and total acidity affects crystal formation and corrosion resistance.
3. **Reasons for poor corrosion resistance and countermeasures**
- Adjust phosphating solution formulas (e.g., use PL-VM).
- Correct acid ratios by adding manganese carbonate or adjusting the main agent.
- Ensure proper solution components and temperature control.
- Extend phosphating time to 10–15 minutes.
- Reduce Fe²+ content using oxidizing agents or replacing the bath.
- Clean workpieces thoroughly before phosphating.
- Avoid overloading the bath to ensure full reaction.
**Conclusion**
- After pickling or sandblasting, phosphating for 10–15 minutes meets 90-minute neutral salt spray requirements.
- Different mounting methods based on fastener size and shape also meet test standards.
- Using PL-VM phosphating solution improves performance, reduces sediment, and enhances corrosion resistance.
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