Galvano Hengelo

Frequently asked questions

Whilst we work B2B in principle, we can also undertake technical plating jobs for private individuals. However, this type of work must be suited to our processes. We are not equipped for decorative (repair) work, for example. Sometimes one of our technical finishes may, however, receive a decorative application and whilst we enjoy doing this kind of work, we do invoice inclusive of VAT.

This typically implies that you wish to have the trailer hot-dip galvanized, which is often incorrectly referred to as “galvanizing”.

We cannot galvanize non-electrically conductive objects. However, there are companies that specialise in this. They can galvanize almost every conceivable object, from children’s shoes to flowers, using a special pre-treatment.

There are 2 types of chrome plating: thin dense chrome plating (decorative) and hard chrome plating (technical), and we do neither of these. This type of work is usually performed by specialist companies. As the two processes differ greatly in terms of application, most companies only perform one of the two processes.

Unfortunately, our relatively large automated lines mean that we cannot accept (private) restoration jobs. These are either not possible from a practical and technical perspective, or are unaffordable. We advise you to contact a specialist restoration company for this type of manual restoration work.

We regularly receive this request. Except for the information on our site, we do not have readily available information packs that we can or wish to freely distribute.

Not every metal can be treated by us and this also varies depending on the surface treatment. You can read about which metals we can apply which layer to on this page and in our datasheets under downloads.

Additionally, surface treatments such as hardening, nitriding, chemical blackening, etc., can cause issues with the adhesion of the layer applied by us. Therefore, it is important to always mention what type of material it is and whether it has undergone surface treatment before it is supplied to Galvano Hengelo.

We can hang products on hooks, clamp them on rotating racks, clamp them on tilting racks and barrel plate them. In addition, it is possible to apply layers using inner anodes (silver).

Partial treatment a product is possible, but we need to assess and evaluate each product individually. The possibilities depend on factors such as shape, type of product, and treatment type.

This varies depending on the process. A rule of thumb for electrolytic processes (where electricity is the driving force, such as silver plating, tin plating, and zinc-nickel) is that the tolerance on the minimum applied layer thickness may be up to >300%.

For chemical processes (where chemistry is the driving force: such as chemical nickel) the rule of thumb for tolerance on the requested layer thickness is ±2µm. Please note: these are rules of thumb. For specific requirements and deviations, there is a lot of flexibility through consultation.

This varies depending on the process. Depositing layers in holes/cavities in electrolytic processes is limited: electricity always follows the path of least resistance and due to the principle of the “Faraday Cage,” there will be little or no deposition in a hole or cavity. Chemical processes (where chemistry is the driving force) do not have this limitation. In principle, as long as there is sufficient supply of fresh process fluid in the hole/cavity (flushing), the layer thickness in a hole/cavity will be equal to the layer thickness on the outer surface of the product.

The degree of corrosion protection is determined according to the standard ASTMB117 or ISO9227.Both standards describe the execution of the neutral salt spray test, where these standards are nearly identical. A component is subjected to this test in a conditioned climate chamber where a continuous salt spray is administered. According to the standard, evaluations of the corrosion pattern are made and documented at fixed intervals. Typically, testing continues until red rust appears.

The practical duration of corrosion resistance must be determined empirically. With our Protalloy® treatment, we achieve a minimum test duration of 1000 hours with a layer thickness of just 5µm. Galvano Hengelo can perform this test in-house.

The layers we apply are very thin, averaging 5-25µm. Consequently, the applied layer will follow the roughness pattern of the substrate and will not have a measurable filling effect.

Hydrogen embrittlement is the phenomenon that occurs during the application of the layer in our process, where hydrogen ions are generated in the process fluid. When treating high-strength materials (materials with a tensile strength greater than 1000 N/mm2), these hydrogen ions (H+) can embed themselves in the crystal lattice of the metal.

After the surface treatment, the hydrogen ions will cluster into hydrogen gas (H2), creating stress and degradation in the crystal lattice. This makes the material brittle: hydrogen embrittlement. This can be prevented by immediately heating the parts after the surface treatment in an oven, driving out the hydrogen gas from the product and preventing hydrogen embrittlement.

Passivation is a process step in which the applied layer is controlled to become passive. This significantly increases resistance to corrosion/deterioration. This is done as a standard procedure for zinc-nickel. At Galvano Hengelo, this passivation layer is Chromium-6 free and transparent/colorless (indicated as: An).

Additionally, passivation can optionally be applied to a silver layer. This helps prevent silver-plated parts from oxidizing (turning black). This passivation is optional.

With the zinc-nickel treatment, it is possible to place a top seal on the product for extra protection. The top seal is an ultra-thin protective layer that provides a better appearance and extends resistance to white rust. A top seal has no influence on delaying the onset of red rust. A treatment without top seal is indicated as T0, a treatment with top seal as T2.

In the zinc-nickel treatment, it is possible to place a top seal on the product for extra protection. The topseal is an ultra-thin protective layer that provides a nicer appearance and extends resistance against white rust. A topseal does not affect delaying the first start of red rust. A treatment without a topseal indicated as T0, while a treatment with a topseal is indicated as T2.

The products should be well packaged to prevent transport damage to Galvano Hengelo. In 99% of cases the packaging is reused, so it must also be suitable for the return shipment without causing damage to the applied surface treatment. Furthermore, the parts should be free from chips, paint, grease, silicones, mill scale, corrosion, and other contaminants.

Any existing cavities in the products should be flushable. If this is not the case, the cavity must be closed 100% liquid-tight to prevent any liquid from entering the cavity.

Yes this is possible. However, we do not have our own transportation facilities, but we outsource this to partners we work closely with, incurring additional costs. 

Our standard lead time is 1+5+1 days = 7 working days.

On day 1, the product is delivered between 7:30 AM and 4:00 PM.

From Day 2 to Day 6, the product is processed.

On day 7, the part is ready for pickup at 7:30 AM.

The above and any possible deviations are communicated to you via order confirmation and delivery note.

Additionally, we offer a 24-hour and 48-hour service upon request and consultation.

You can expect a lead time of up to 2 days for a quotation from us as standard.

This is not a problem at all. We are happy to work with you to provide as much assistance as possible and make your live as easy as possible. 

The certificates and statements can be found on our website under downloads.