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Car gearbox with cutaway

Phosphating

How do you protect high strength steel fasteners without inducing hydrogen embrittlement?*

A major trend in automotive fastening technology is smaller parts using high strength steel fasteners to reduce component weight. The expanding new categories of fasteners   replace traditional permanent joining methods, such as adhesives, rivets, and welding, which inherently do not allow component disassembly.  Additionally new powertrain, gearbox, and fastener designs are being investigated for use in electrical vehicles. 

In these applications KeyKote phosphate solutions provide corrosion and wear resistance. These coatings readily absorb oil and other lubricants, providing predictable coefficient of friction properties. Read more about the phosphate coatings in our article published in Fastener and Fixing magazine.

Types of KeyKote phosphate coatings 

Automotive engineers can choose between 3 types of coating:

  1. Heavy weight zinc phosphate, recommended for corrosion resistance.
  2. Manganese phosphate gives excellent wear resistance.
  3. Micro-crystalline zinc phosphate recommended for predictable coefficient of friction properties.

Our sustainable processes are nickel-free, an important consideration for applicators as it reduces sludge formation to meet local waste water discharge criteria.

To find out more about protecting your high tensile fasteners, contact us today.

*HE also known as hydrogen assisted cracking (HAC) and hydrogen-induced cracking (HIC), describes the embrittling of metal after being exposed to hydrogen.