For many decades, hexavalent chrome pre-treatment has been the standard for aluminium. More recently, chrome-based pre-treatment processes have come under pressure for environmental and health and safety reasons. The first chrome-free pre-treatment processes started to appear in the marketplace about 20 years ago. Today, with almost two decades of operating experience gained, and hundreds of users worldwide, the performance of these programmes is equivalent to the "old" hexavalent chrome products. Users of chrome-free technology include all the world’s biggest names in the industry. Chemetall’s Gardobond® X and OXSILAN® AL series - state-of-the-art chrome-free pre-treatment processes for aluminium - help producers maximise adhesion and corrosion protection. Both Gardobond® X 4707 and OXSILAN® AL 0510 hold Qualicoat approvals.
Chemetall helps meet the most demanding quality goals while eliminating heavy metals, thus reducing health, safety and environmental risks and costs.
Chemetall has now launched Gardo® TP 10748 – an additive for alkaline etching. This new product offers significant improvements for E-6 etching concerning
Furthermore, Chemetall has given a lot of thought to the topic of hot sealing with the intention to minimise the problems occurring in daily operations and thereby to contribute to optimising process safety. These thoughts have led to Chemetall's new hot-sealing product series: Topseal. It comprises three different processes adapted to the customers' anodising plants:
When optimally used, products of the Topseal Gardo® series achieve weight loss values of 10 – 15 mg/dm². Over the bath service life, this value rises appreciably less than with standard products.
All products can be analysed online or in Chemetall's laboratory. Chemetall Topseal reliably prevents the formation of sealing smut, gives clean, smut-free surfaces and offers benefits especially on coloured surfaces.
According to the new European Commission Regulation No 790/2009, all mixtures containing borate must be re-classified as of December 1st, 2010 – all products containing 8.5 % (and more) of borax must be labelled with the skull and crossbones.
Most powder degreasers for anodised aluminium contain borate – and starting December 1st, 2010, these formerly harmless cleaning baths will suddenly be classified as toxic! Chemetall has the solution: Gardoclean® T 5281, a completely borate-free aluminium cleaner.
The product is liquid and thus easy-to-use, it provides good cleaning results also at temperatures below 60 °C (depending on condition of parts) and automatic dosage is possible.
Gardoclean® T 5281 has been specifically designed for cleaning aluminium both in the anodising and pre-treatment processes.