| 摘要 |
<p>Title of the Invention METHOD OF INTERNALLY COATING STEEL DRUMS Drum shells, lids and filling hole covers, prior to the assembly of these parts to make steel drums, are pre-treated by spraying with an alkaline solution, iron phosphate and thereafter with a standard rust inhibitor, and the interiors of the drum parts are coated by electrostatic spray application with a thermosetting epoxy-based powder to a critical thickness which eliminates subsequent cracking and subsequent vulnerability to destructive substances such as tomato paste and other more corrosive chemicals. The drum parts are preheated prior to the application of the powder to accelerate the fusion of the powder particle coating as well as reduce the associated material application problems. After application of the powder to the container interiors, the components are again subjected to oven temperatures to set and cure the coating.</p> |
