- Sep 07, 2018 -
1. Almost no hydrogen embrittlement
Ultra-high-strength steel has hydrogen embrittlement sensitivity, while galvanizing and cadmium plating are difficult to dehydrogenate. Usually, it is stress-relieved before plating. After plating, it needs to remove hydrogen for 24 hours. It is difficult to ensure complete dehydrogenation, while zinc-nickel alloy coating has moderate The pores are easy to remove hydrogen, and the coating itself has less hydrogen embrittlement, so it has a wider application space in the aerospace industry.
2. Excellent toughness and bonding
Zinc-nickel alloy coating has good toughness, can be subjected to extrusion deformation without brittle cracking during assembly, and has the advantages of cadmium plating. It is difficult to spot weld of ordinary galvanized steel sheet, and cannot be used for automobile covering parts, and zinc-nickel alloy steel sheet has excellent weldability. It can be widely used as a car cover. After conventional phosphating, its corrosion resistance is greatly improved.
3. Higher hardness
Alkaline coating hardness is 90~120HV, while zinc-nickel alloy coating hardness can reach 220~270HV, so it is more resistant to scratching. It can be imitation silver after white blunt, bright plating can be polished with chrome, or can be directly chrome. Zinc-nickel alloy has a high melting point (750~800 °C) and good heat resistance. It has excellent corrosion resistance after dehydrogenation heat treatment and is suitable for use on engines.