The applicability of chromium-free passivation technology in milk powder packaging is investigated by analyzing the physicochemical properties and safety performance of chromium-free passivated tinplate and milk powder cans made from it. Findings reveal that the chromium-free passivated tinplate excels in surface purity, wettability, and corrosion resistance, complying with GB 4806.9—2016 standards, EU RoHS Directive, and REACH Regulation for food safety. The chromium-free passivated tinplate cans exhibit favorable sensory perception, corrosion resistance, and adaptability, with migration and harmful substance contents well within standard limits, close to the performance of traditional tinplate milk powder cans. The chromium-free passivation technology offers an eco-friendly and safer alternative for milk powder cans, meeting the high standards of infant food safety, responding to global environmental policies and the requirements of green sustainable development.