background knowledge Archives - Alufinish

Puzzling black residues: A Challenge in hot sealing baths

Benedikt Wolter — Tue, 27 Jun 2023 08:47:56 +0000

It is well known in anodising operations that, over time, deposits accumulate on the plastic balls used to cover (minimise heat and evaporation loss) hot sealing baths. Unwanted white residue: a common problem that can be addressed These usually show up as white, crust-like residues that are deposited and strengthened on the cover balls by […]

The post Puzzling black residues: A Challenge in hot sealing baths appeared first on Alufinish.

What happens during cold sealing?

Benedikt Wolter — Fri, 13 Jan 2023 12:47:49 +0000

The porous aluminium oxide layer that is present after anodising or colouring is still unsealed. This state would not provide long-term protection, e.g. on building surfaces. Subsequent sealing of these layers is therefore essential for long-term protection. In addition to the frequently used hot sealing, it is also possible to seal the aluminium oxide […]

The post What happens during cold sealing? appeared first on Alufinish.

Removing polishing pastes – The important aspects of this process

Benedikt Wolter — Wed, 11 May 2022 15:59:16 +0000

For a shiny and brilliant-looking aluminium surface, mechanical polishing of the raw material is often carried out prior to the actual chemical pretreatment process in the anodising plant. This mechanical polishing is then usually done by using special, solid polishing pastes which are applied to the polishing wheel for this purpose. These pastes usually contain […]

The post Removing polishing pastes – The important aspects of this process appeared first on Alufinish.

Where does the energy for aluminium production come from?

Benedikt Wolter — Fri, 29 Apr 2022 18:35:43 +0000

To further advance sustainability in the aluminium industry, it is important to understand where the energy for the production comes from. Here, the difference between the production of primary aluminium and the extraction of secondary aluminium through recycling is significant. But how is aluminium extracted in the first place? Primary aluminium is extracted from the […]

The post Where does the energy for aluminium production come from? appeared first on Alufinish.

What happens during hot sealing?

Benedikt Wolter — Mon, 11 Apr 2022 18:25:33 +0000

After anodising and colouring aluminium surfaces, it is particularly important to seal the created porous aluminium oxide layer well. This process can be carried out using various seal methods. One possibility is the hot sealing. For this, fully demineralised water is used at a temperature of at least 96°C, to which a sealing additive […]

The post What happens during hot sealing? appeared first on Alufinish.

Mistakes while desmutting are possible!

Benedikt Wolter — Thu, 03 Feb 2022 21:26:10 +0000

As in all chemical pretreatment steps in the anodisation of aluminium, mistakes can also be made in the desmutting process. The following are two examples of errors that can occur. Raw material, initial state Material after desmutting This material was cleaned, briefly alkaline etched and then pretreated in the desmutting bath. Already after etching, the […]

The post Mistakes while desmutting are possible! appeared first on Alufinish.

Free of deposits for anodising thanks to good desmutting

Benedikt Wolter — Wed, 19 Jan 2022 18:02:54 +0000

Desmutting is used in chemical pretreatment after an alkaline etching process or a polishing process. Due to the removing effect ("etching") of these process steps, a more or less strong mix of different alloy components remains on the surface, depending on the material alloy. This is often visible as a coating, but sometimes not. […]

The post Free of deposits for anodising thanks to good desmutting appeared first on Alufinish.

Pre-corrosion and its effects on anodising processes

Benedikt Wolter — Wed, 01 Dec 2021 07:54:00 +0000

When aluminium reacts with its environment, this often causes pre-corrosion. Different, mostly barely visible changes on the surface of the aluminium are the result. But what are the effects of pre-corrosion? If pre-corrosion occurs on the material, this often leads to unsaleable goods. This is because the pre-corrosion on the raw material is usually only […]

The post Pre-corrosion and its effects on anodising processes appeared first on Alufinish.

Colouring anodized aluminium with Alumino

Benedikt Wolter — Wed, 27 Oct 2021 07:58:42 +0000

Aluminium also looks very good coloured. The Alumino series from Alufinish is based on organic colours and is therefore especially easy to embed in the anodised layer. But how does this dyeing process work? In this video, Mr. Sondermann explains to you how aluminium is correctly coloured with Alumino from Alufinish.

The post Colouring anodized aluminium with Alumino appeared first on Alufinish.

How to check cleaning effect before treatment-process?

Benedikt Wolter — Mon, 11 Oct 2021 15:08:27 +0000

In the treatment process of aluminium – for example in anodising – a clean surface is very important. The following question often comes up: how can we check if an aluminium surface is free of grease and oil when it comes out of the cleaning bath? Certainly, this can be checked with analytical equipment in […]

The post How to check cleaning effect before treatment-process? appeared first on Alufinish.