Neodymium iron boron magnets are categorized into two types: Sintered NdFeB and Bonded NdFeB. Bonded NdFeB exhibits magnetic properties in all directions and is corrosion-resistant. In contrast, sintered NdFeB is prone to corrosion and requires surface coating, commonly with zinc, nickel, eco-friendly zinc, eco-friendly nickel, nickel-copper-nickel, and eco-friendly nickel-copper-nickel coatings. To prevent rusting of NdFeB, it is recommended to use vapor-phase corrosion inhibitors, such as rust-proof packaging bags and rust-proof sponges.

There are many varieties of rust-preventing paper for multi-metals, and the market for rust-preventing paper is quite diverse. Many customers are unsure which type of rust-preventing paper to use. The main difference lies in the use of qualified rust-preventing base paper, the pH value, sulfur content, chlorine content, the paper's water absorption, tensile strength, and more. Using raw wood pulp paper can reduce the presence of impurities that may cause metal corrosion, whereas recycled paper is definitely not beneficial for metal corrosion prevention. Choose carefully. For example, in the case of neodymium-iron boron, after product machining, it undergoes ultrasonic cleaning, followed by phosphatizing treatment before shipping, and dipping in rust-preventing oil. This process is rather complex, with ultrasonic cleaning being quite effective. However, if the rust-preventing oil is not dried after dipping, and much moisture remains on the product surface, there could be significant issues with sea shipping. In such cases, it is recommended to improve the cleaning process and specifically use neodymium-iron boron rust-preventing paper. "Yongyu" brand rust-preventing paper can customize a suitable rust-preventing packaging solution for you.