Nickel boron coatings do not rust like iron-based metals because they contain no elemental iron, but they can still corrode under certain environmental conditions. Nickel boron and nickel boron nitride form a highly protective surface that resists oxidation, moisture, and chemical exposure — significantly reducing the risk of corrosion on coated parts.
These coatings are often used in firearms, aerospace components, and industrial tools for their high hardness, low friction, and exceptional corrosion resistance. While not immune to breakdown in extremely aggressive environments (e.g., strong acids or salt fog over time), nickel boron coatings provide long-lasting protection in most industrial and mechanical applications.