Without considerably more information, it is impossible to determine how much protection your corporation can provide you. Usually this is very fact dependent and depends on how separately you treated the company business from your own personal finances. The bigger problem will probably be personal guarantees. It is extremely unlikely that you did not personally guarantee the credit card when you signed up. Very few "business" cards do not have personal guarantees in the fine print. When the company does not pay, they will come looking for you.
Please note that I do not practice in Illinois and, therefore, this response is intended as general information and not specific legal advice.