American hose clamp: divided into two types: iron galvanized and stainless steel. The main difference is that the buckle is punched (that is, the eye button is buckled). The market is mainly made of stainless steel, and the price is mainly used in the high-end market such as auto parts.
First, the hoop characteristics
The hose clamp is a fastener at the junction of the soft and hard pipe. Hose clamps solve the problem that the prior art hose clamps are used for the connection of small diameter soft and hard pipes, and the liquid and gas leakage problems are generated. The hose clamp adopts an open inner and outer ring structure and is fastened by bolts. The hose clamp effectively solves the problem of dead angle when connecting small diameter soft and hard pipes, and causes liquid and gas leakage problems. The structure is simple and easy to manufacture, and the cost is 30% of the original product. The hose clamp is widely used in motor vehicles, petrochemicals, Pharmacy, food, brewing, sewage treatment, purification, dust removal, auto parts and other equipment.
Second, the characteristics of the hose clamp: the friction of the worm is small, suitable for high-end high-end models or anti-corrosion materials. The hose clamp has wide application range, anti-torsion and pressure resistance, the torsion torque of the hose clamp is balanced, the locking is firm and tight, and the adjustment range is large. The hose clamp is suitable for the fasteners connected with the soft and hard pipe of 30mm or more, and the appearance is beautiful after assembly.
Third, the role of American-style waiting
The hose clamp is a fastener at the junction of the soft and hard pipe. Hose clamps solve the problem that the prior art hose clamps are used for the connection of small diameter soft and hard pipes, and the liquid and gas leakage problems occur. The hose clamp adopts an open inner and outer ring structure and is fastened by bolts. The hose clamp effectively solves the problem of dead angle when connecting small diameter soft and hard pipes, and causes liquid and gas leakage problems. The structure is simple and easy to manufacture, and the cost is 30% of the original product. The hose clamp is widely used in motor vehicles, petrochemicals, Pharmacy, food, brewing, sewage treatment, purification, dust removal, auto parts and other equipment.
Hose Hoop Features: The worm has low friction and is suitable for connection between high-end and high-end models or anti-corrosion materials. The hose clamp has wide application range, anti-torsion and pressure resistance, the torsion torque of the hose clamp is balanced, the locking is firm and tight, and the adjustment range is large. The hose clamp is suitable for the fasteners connected with the soft and hard pipe of 30mm or more, and the appearance is beautiful after assembly.
Fourth, the fastener technology of the hose clamp
Fastener Technology: Improve Corrosion Resistance of Phosphating Fasteners
1. Problems
The corrosion resistance of the phosphating film was tested in accordance with GB11376-1989 for neutral salt spray, and no rust occurred for 90 minutes. The fasteners have a neutral salt spray test failure rate of 45%. The appearance and color of the phosphate film are inconsistent, the crystal is coarse, and the ash is much.
2. Influencing factors
2.1 solution into a poor distribution ratio
The composition and ratio of the solution have a great influence on the phosphating quality. When the self-adjusting calcium salt phosphating solution is used for production, the phosphating film formed on the surface of the workpiece has coarse crystals, a large amount of ash, and poor appearance quality. The prepared black phosphating solution produces relatively more precipitates during production, and basically needs to smash the sediment every day. PF-MIAM and PF-MIAR phosphating solutions were used for comparison with various phosphating solutions. The phosphating solution is simple to adjust, and the phosphating film is finely crystallized, so that the corrosion resistance of the automobile fastener is greatly improved, and the workpiece has less ash and less solution precipitation. Its phosphating effect can basically meet the black phosphating requirements of automotive steel fasteners.
2.2 Influence of pre-phosphorization treatment
The small fasteners are packed in baskets, the workpieces are easy to contact, and they cannot be fully phosphatized during the phosphating process. It is difficult to form a complete phosphating film at the contact parts, so the resistance to neutral salt spray is poor; If it does not touch, so that it can fully react, it will have a multiplier effect on improving the resistance to neutral salt spray.
2.3 Effect of solution temperature
When the temperature of the phosphating solution is increased, the bonding strength, hardness and corrosion resistance of the phosphating can be improved. However, the temperature should not be too high, otherwise Fe2+ will be oxidized to Fe3+, and the precipitate will be increased, and the solution will evaporate quickly, resulting in unstable solution.
2.4 acid ratio is incorrect
The acid ratio refers to the relationship between free acidity (Tb) and total acidity (Ta). The free acidity is too high, and the effect of steel parts is fast, and a large amount of hydrogen is deposited, so that the interface layer phosphate is not easily saturated, resulting in difficulty in crystal nucleation, coarse and loose pores, loose pores, reduced corrosion performance, and phosphating time. Prolonged; the free acidity is too low, the phosphate film is thin, and even no phosphate film is formed. If the total acidity is too high, the film layer will be too thin, and the total acidity will be too low to make the film layer loose and rough. Therefore, the total acidity is generally controlled at 85~140 points.
3. Reasons for poor corrosion resistance and countermeasures
Reasons for the poor corrosion resistance of phosphating fasteners and countermeasures
(1), solution to distribution ratio is not good: improve the phosphating solution formula, using PL-VM phosphating solution.
(2), the acid ratio is not correct: the free acid is too high, can be adjusted by adding manganese carbonate, etc.: the total acid is too low, the main agent can be adjusted, and the total acid is controlled above 85 points.
(3), the main components of the solution is low: supplement the main liquid.
(4), the main components of the solution are not correct: after the solution is cleared, the bath temperature is controlled at about 95 °C.
(5) The phosphating time is too short: the phosphating time is controlled at 10~15min.
(6) High Fe2+ content in the solution: adjust the Fe2+ content by adding an oxidizing agent such as hydrogen peroxide or replace the bath.
(7), there are oxides in the solution: replace the bath, or strengthen the cleaning of the workpiece before the pickling.
(8), pre-treatment is not clean: sandblasting or fasteners to maintain a good surface condition before phosphating.
(9), too much load: use the hanging or reduce the load, so that the fasteners maintain a certain gap, so that it can fully react.
4. Conclusion
(1). According to different fasteners, after pickling or sand blasting, and then phosphating for 10~15min, it can basically meet the requirement of neutral salt spray test for 90min.
(2). According to the shape and size of the fasteners, phosphating for 10~15min by different mounting methods can basically meet the requirements of neutral salt spray test.
(3). The composition of the self-mixing phosphating solution is not well controlled, the solution adjustment is difficult, the precipitation is much, and the workpiece is suspended in the ash, and the workpiece is liable to cause excessive corrosion during the phosphating process. Using PL-VM phosphating solution, the solution parameters are simple to adjust, the sediment is less, the workpiece is ashed, the film layer is fine and fine, and the neutral salt spray time can be improved. The corrosion degree of the workpiece after neutral salt spray test is small.
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