The material of a folding knife can vary depending on the specific model and brand. Many folding knives are made from stainless steel, which is generally known for its corrosion-resistant properties. Stainless steel contains chromium, which helps to prevent rust and corrosion.However, it is important to note that not all stainless steel is equal. Different grades and compositions of stainless steel can offer varying levels of corrosion resistance. Higher-quality stainless steel, such as those used in premium folding knives, tend to have better corrosion resistance.That being said, even stainless steel blades can still corrode under certain conditions. Factors like exposure to saltwater, high humidity, acidic substances, or neglecting proper maintenance can lead to corrosion over time. Regular cleaning, drying, and occasional oiling of the blade can help prolong its corrosion resistance.If youre specifically looking for a folding knife with excellent corrosion resistance, it is advisable to research and choose a reputable brand known for using high-quality stainless steel and employing effective corrosion-resistant treatments or coatings on their blades.