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"Any kick or ban from a chat channel is only temporary and, or may not, include a notification as to the reason for this action being taken against your account, at the time it was taken.
When you open a support ticket, the staff member that responds will tell you: The moderator code of conduct page that she links to tells you to open a ticket with Warframe Support where it will be reviewed by Warframe staff. She also says that you're able report issues with chat moderation if you feel it is in error. Your chat simply stops working but you will not be told why. You don't get a system message when you do get banned. Unfortunately, those changes aren't actually in place. Rebecca made this post about a year ago outlining changes that they supposedly made to chat moderation: