Except for the material, what other factors will affect the durability of casters in humid environments?

The durability of casters in humid environments is influenced by multiple factors, including not only the moisture resistance of the material itself, but also structural design, surface treatment, operating conditions, maintenance level, and environmental media.

Structural design directly affects water ingress and retention. Lack of effective seals between the bearing and axle (such as O-rings or dust caps) allows moisture to easily penetrate, leading to lubrication failure and rust. Design flaws that prevent water accumulation (such as the absence of drainage holes) can also accelerate metal corrosion. Surface treatments such as galvanizing, electrophoresis, or painting that exhibit missing plating, scratches, or lack of passivation will reduce protective performance, especially in vulnerable areas such as corners and welds.

Regarding operating conditions, overloading can widen seal gaps and accelerate wheel aging; frequent use can lead to lubrication loss and seal wear; and rough or chemically contaminated surfaces can exacerbate material damage. Maintenance is crucial; failure to clean, lubricate, or repair minor damage can lead to localized corrosion and performance degradation.

Environmental media such as salt spray, acidic and alkaline vapors, or temperature and humidity fluctuations can cause pitting corrosion, material embrittlement, or microbial corrosion, further shortening the lifespan. Furthermore, dissimilar metal contact or eccentric installation during assembly can cause electrochemical corrosion or seal wear.

In summary, the durability of casters in humid environments requires a multifaceted approach, including material selection, structural optimization, proper use, and regular maintenance. A single factor alone is insufficient to ensure long-term performance.