Higher productivity, ease of handling and no nickel

Henkel's pipeline of innovations for the aluminium industry does not stop short when it comes to anodising, one of the most established technologies for aluminium processing. Complementing its latest developments for optimising the conversion coating of aluminium products, the company also offers improved BONDERITE^® technologies for the three key steps of degreasing, etching and hot or cold sealing in the aluminium anodising process.

Aluminium in its raw, unfinished state reacts with oxygen in ambient air and other weathering influences, resulting in an uncontrolled and undesirable, unaesthetic oxide layer. Although galvanic coating can be used to prevent this effect, it adds an extra layer of material and weight. In contrast, anodising directly converts the outermost aluminium layer into a controlled, thin and smooth oxide skin, reliably protecting the surface from further oxidisation (corrosion). Depending on the specific needs of the end product, the typical thickness of the anodised layer is normally between just 5 and 25 µm.

 "As the demand for lightweight and aesthetic aluminium parts increases, manufacturers need cost-effective anodising solutions to maximise both the productivity and sustainability of their processes," says Henkel's Business Development Manager Light Metal Finishing. "Our BONDERITE^® portfolio for aluminium anodising comprises specialised products for all process steps, beginning with chemicals for mechanical pretreatment, e.g.: grinding, polishing and cleaning; up to the substances for the chemical process: degreasing, etching, de-smutting, brightening, anodising, electrolytical colouring and sealing. The range is actually fronted by a new, non-etching, one-component degreaser, a long-life etching additive for outstanding E6 finish, and a high-productivity hot sealer as well as a nickel-free cold sealing additive."          

^{Even after 100 years of aluminium anodising, Henkel’s most recent innovations for degreasing, etching and sealing demonstrate that there is still room for significant improvements in the productivity and sustainability of this electrochemical technology.}

The first step in anodising is always dedicated to degreasing the surface. For brightened or high-gloss aesthetic parts that can't be etched for anodising, Henkel has developed BONDERITE^® C AK 62115.

The one-component degreaser simplifies product handling compared to conventional two-component alternatives and is also highly reliable in removing residual brushing paste from the part surface.

As a key player in the market for long-life etching additives, Henkel is well-known for its family of BONDERITE^® C AK products, combining low chemical consumption with optimised E6 results. E6 refers to a more thorough etching process compared to E0 and is frequently used to eliminate larger surface defects by actually removing part of the material. One of the company's most recent product solutions in this field is BONDERITE^® C AK 62250, which has been custom-tailored to combine the required high etching and finishing levels with excellent bath stability, including reduced drag-out and no foaming. This also makes it an economic compromise between caustic soda and other long-life etching products.

The final step in the aluminium anodising process is sealing. Two highlights in Henkel's dedicated product offering provide breakthrough solutions addressing demands for increased performance in hot sealing and minimised toxicity in cold sealing. BONDERITE^® M ED 11011 is Henkel's latest hot sealing additive, developed to at least double the standard life span of sealed parts and increase the productivity of single-step hot sealing by a minimum of 20 percent. Hot sealing with this new product takes exactly 3 min/µm, fixed, as a standard sealing time. By reducing the make-up of the bath by 50 percent or more, the innovative solution also results in a smaller CO2 footprint. Altogether, processors using BONDERITE^® M ED 11011 can benefit from substantial cost savings per square metre of hot-sealed material.

With BONDERITE^® M ED 11150/11151, Henkel is also underscoring its leading role in cold sealing solutions for anodised aluminium. Although it can involve several steps, cold sealing is a very attractive high-productivity alternative to hot sealing, but has traditionally been associated with nickel and subsequent toxicity issues. Henkel's new game-changing cold sealing additives are completely nickel-free, without compromising process time or sealing quality, and also QUALANOD approved.