As used in this chapter, the term:

(1) "Junk" means any used article of commerce which is composed principally of iron, steel, brass, copper, zinc, or their alloys, or any other base metals and which is commonly bought for the purpose of resale or refabrication, or both.

(2) "Junk dealer" means any person, firm, or corporation or officer, agent, or employee of any person, firm, or corporation who engages in the purchase of junk for the purpose of resale or refabrication, or both.