Steel (1997) on Netflix

John Henry Irons is a weapons designer for the United States military. When his project to create weapons that harmlessly neutralize soldiers is eradicated, he resigns in disgust. When he sees criminal gangs are using the weapons that he helped manufacture on the street, he uses his resources and his Uncle Joe's equipment in his junkyard to fight back against the man who's been selling them to those gangs: Nathaniel Burke. John Henry Irons, creates an alter ego, a super-hero known as "Steel," to combat an evil street gang. In order to do so, he uses the resources that are available to him to forge himself a suit of armor and the weaponry necessary to carry out his war on crime.