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FAQ Aftertreatments

Spring cleaning ensures that a technical spring can be delivered without chemical resedue. Of these, the forerunner is ASML.

TEVEMA works with ASML grade 2 and grade 4 standards to clean springs. We maintain ASML’s standards because they define market quality. All technical springs are available with this post-treatment. Spring cleaning cleans the spring of any chemical residue. This is important with products that need to be completely clean.

You will receive an email through our sales department with a track-and-trace when we have shipped it.

Phosphating puts a layer of insoluble phosphates on the engineering spring.

Phosphating technical springs gives better protection against corrosion. In addition to corrosion protection, it also provides a wear layer for springs that have heavy-duty applications in moving parts of machinery.

Passivation is often the process after pickling in technical springs. This restores the technical spring in stainless steel to its original corrosion protection.

In electrolytic pickling and etching, the technical springs are connected to a power source and immersed in a pickling or etching liquid. This causes the oxide skin on the technical spring to release better.

Bullet blasting as a method to significantly improve the operating (fatigue) life of springs is certainly not new. The commercial origins of the technique date back to the auto industry of about 1930, and today almost all cars use blasted valve springs and, in many cases, suspension springs. This is also the case with TEVEMA suspension springs. But this post-treatment is also suitable for ordinary technical springs. The peening process is relatively inexpensive and has proven to be able to extend the life span by five to 10 times or more compared to unhardened springs.

Au-plating is the gilding of the technical spring. The technical spring is coated with a thin layer of gold. Gold plating has been used in technical springs in the semiconductor and electronics industries for several applications. Gold plating of technical springs ensures good chemical durability and a hardness of 150-200 HV (85HRB). In addition, gilding technical springs gives better contact resistance.

Powder coating provides a coating layer of fine powder on the spring.

Powder coating of technical springs gives them good protection against corrosion. The powder coating process is more environmentally friendly than most surface treatments. TEVEMA’s powder coating has passed ISO salt testing. This guarantees protection against corrosion.

Tinning a spring gives the spring a tin layer

Tinning of technical springs is common for bronze products in electrical engineering. Furthermore, TEVEMA also has technical springs used in soldering. Combining these with tinning technical springs gives good solderability.

Silver plating puts a layer of silver on the technical spring. Silver is a good conductor of electricity. For springs that actually need low resistance but good electrical conductivity, silver plating is a solution. The good electrical conductivity is because the silver adheres well to the base material, improving electrical conductivity. Silver plating of feathers can be done by normal and hard silver plating. Hard silver plating provides extra hardness, which in turn gives extra protection, resulting in a longer life.

Copper plating creates a copper layer on the spring.

Mainly, copper plating of technical springs has been used as an intermediate layer for chrome plating, nickel plating and silver plating of springs. As a top coat, copper plating is suitable for decorative purposes.

The brassing gives a brass coating on the spring. Knives as a surface treatment is mainly done for decorative purposes. In addition, an application for this is also suitable for improving adhesion of rubber to steel.

Chrome plating of technical springs is done through a galvanic process. Chrome plating is used to make springs rust and/or wear resistant. Furthermore, chrome plating gives a beautiful silver luster to the technical spring.

Electropolishing technical springs gives a rougher (approx 0.2 mu) surface because all dirt is removed and only the parent material remains on the surface. The biggest reason to have something electrolitically polished is to clean the product. It is particularly important for use of technical springs in chemistry, pharmaceuticals, transportation and surgery. This can also be done well in conjunction with spring cleaning. In doing so, the spring is fully suitable for tasks in which there is and should be no mess.

Nickel plating of technical springs means that springs are coated with a layer of nickel. The nickel is a protection against rust and other corrosion. Nickel prevents the base material from migrating to the precious metal surface allowing it to foul. Nickel plating can be done galvanically and chemically.

To be known, technical springs have the following post-treatments:

  • Nickel plating
  • Galvanize
  • Chrome plating
  • Vermessingen
  • Copper
  • Redeem
  • Tinning
  • Powder coating
  • Au-plating
  • Bullet blasting
  • Pickling
  • Passivation
  • Phosphating
  • Electolytic polishing
  • Cleans
  • Laser Welding
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