To accelerate the rusting process of 1/4" steel within 2-3 weeks, a combination of high heat, moisture, and salt is recommended. Applying a salt solution can enhance oxidation, while using a torch to heat the metal can further expedite the process. Additionally, incorporating acidic substances like hydrochloric or sulfuric acid may significantly increase the rate of corrosion, although this might not be classified strictly as rusting. Electrolysis is another method mentioned, where reversing the polarity of electrodes could facilitate rust formation. However, achieving deep rust quickly may be challenging, as initial attempts have only resulted in surface rust.
