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DONGGUAN VERRO INDUSTRIAL CO.,LTD [China (Mainland)]
Business Type:Manufacturer
City: Dongguan
Province/State: Guangdong
Country/Region: China (Mainland)
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caster know-how
Steel surfaces of wheel and caster components are zinc-plated or provided with a protective lacquer coating.
The salt spray test is one of the most common test methods used to check the corrosion protection of different substances. A salted solution is sprayed on the components, producing a corrosive attack and the time is measured until white and red rust appears.
Test result data show:
| Surface protection | White rust | Red rust |
| Zinc-plated,blue | ~48h | ~96 |
| Zinc-plated,yellow | ~144h | ~240h |
| Zinc-nickel | ~720h | |
| Lacquering | ~192h | |
| Poweder coating | ~192h |
In case of small damages zinc-plated surfaces have the advantage that zinc starts to corrode before steel due to electrochemical processes.Therefore the bright spot does not rust. the zinc-plated compopnents undergo an additional chemical treatment which is called passivation.A distinction is made between blue and yellow passivation as the yellow passivation provides a better protection against corrosion than the blue passivation.
Advantages of zinc-nickel plating,which can be additionally passivated and sealed,are high temperature resistance and prevention of white rust.
Lacquered components lose their corrosion protection when the lacquer coating is damaged.The rust also damages intact layers which are located directly next to the affected area.
The cathodic dip painting is an electrichemical process which is used to coat complicated structure equally in a dipping path. High temprature resistance and good surface quality are two benefits of this process.
With electrostatic poweder coating the powder used for the coating is sprayed on the components and fired afterwards.
Stainless steels have a well-known good corrosion behaviour.The primary used material is a high-alloyed chromimum-nickel steel.
Synthetics are characterized by a very high corrosion resistance. Mainly the materials nylon and proplyene are used.
Salt spray test:
