Why do mining crushers exported abroad begin to show signs of rust just one year after use? What exactly causes this issue?

With the booming growth of global trade, a large number of domestic mining crushers have entered the international market. However, the durability of paint coatings on exported equipment has become a growing concern. In fact, most companies still strictly follow domestic anti-corrosion standards when applying paint to crushers. Surprisingly though, just a year after these machines are put into operation overseas, issues like chalking and rusting begin to appear—seriously affecting both equipment performance and company reputation.

The root cause? Most have overlooked the harsh conditions these crushers face during transportation overseas. Domestically, mining crushers usually operate in a C4 corrosion environment, and coatings applied under C4 standards can offer reliable protection.

However, once exported, crushers must endure marine transportation, exposing them to a much harsher CX high-corrosion environment. This environment often includes high salt spray, intense UV radiation, and extreme temperature and humidity variations. If companies continue using paint systems based on C4 domestic standards, it's simply insufficient to handle the corrosion threats encountered from transport to final use.

That’s why the paint coating fails within just one year, and the durability proves inadequate.