Russian Armor rusting away

Hey folks, without this getting political I was curious about something. I am sure everyone is aware of the invasion in Ukraine. But I don’t want to talk about any of the political or military decisions made, I want to ask about the armor. In particular all of the armored vehicles that have been killed and set on fire. Is it odd that it is rusting so heavily and so quickly? Is this do to the chemical make up of the steel used, or maybe other factors?
I figure the folks here would have some of the best knowledge about this.