The term burnishing means a process for the darkening of mainly ferrous materials, such as cast iron and wrought iron, unalloyed or alloyed steels.
The most frequently used variant is dip burnishing. For this process, the iron and steel pieces are dipped in highly concentrated, boiling, alkaline, oxidizing salt solutions, generating very dark iron oxide layers on their surfaces. The shade of black being determined by the material quality, the surface treatment and the type and condition of the burnishing bath. This process is mainly used to give workpieces an attractive appearance and to increase their corrosion resistance, while maintaining their dimensional stability.
Burnishing describes a form of surface refinement in which a black protective layer (iron oxide FE3O4) is formed. This is supposed to prevent the corrosion of ferrous surfaces. The result is not a coating of the surface, but a chemical reaction of the base material. For this purpose, the material is immersed in different baths. First, the surface is cleaned and degreased and optionally further prepared. The actual burnishing bath sequence then takes place. It usually consists of 1 to 3 levels. Finally, the material is rinsed and preserved.
Burnishing is an alkaline process. A maximum temperature of less than 150 ° C is achieved. That means the burnishing temperature is well below the tempering temperature. Since the material is completely immersed in the baths, it undergoes a complete surface treatment. It is important that the component is made entirely of materials that can be burnished.
fields of application of burnishing
This process is mainly used to give workpieces an attractive appearance and to increase their corrosion resistance, while maintaining their dimensional stability.
Wir bieten weltweit alle Arten von Wärmebehandlungsprozessen an. Unsere Anlagen sind logistisch eng miteinander verknüpft, so dass Ihnen alle Verfahren zur Verfügung stehen. Erfahren Sie mehr zu unseren Wärmebehandlungsverfahren.
Heiß-Isostatisches Pressen (HIP) dient der Beseitigung von Porosität. Sie benötigen bei Lötverbindungen eine hohe mechanische Haltbarkeit und Unempfindlichkeit bei hohen Temperaturen? Wir bei Aalberts surface technologies bieten die Lösung durch Hartlöten (brazing).
Polymerbeschichtungen können auf viele Grundmaterialien aufgebracht werden und bieten lang anhaltenden Schutz. Sie sind mechanisch besonders gut mit dem Untergrund verankert und bieten verbesserte Gleiteigenschaften und/oder hohe Verschleißfestigkeit.
Mit 40 Jahren Erfahrung in der kontinuierlichen Veredelung von reel to reel können Sie sich auf Aalberts surface technologies verlassen, um innovative Lösungen zu finden. Unser Service umfasst Trommelgalvanik, kontinuierliche selektive Galvanik und Gestellgalvanik.
Fast alle metallischen Grundwerkstoffe können mit unseren selbstentwickelten und patentierten Verfahren durch Oberflächenbeschichtungen in ihren Eigenschaften optimiert werden, egal ob sie besonders hart, glatt, verschleißfest oder korrosionsbeständig sein sollen.
We offer all types of heat treatment processes. Our facilities are closely interlinked in terms of logistics, which means that all processes are available to you. For a complete list and description of heat treatment technologies please select the button.
Hot isostatic pressing (HIP) is used to eliminate porosity. Do you need high mechanical durability and insensitivity to high temperatures for solder joints? We at Aalberts surface technologies offer the solution through brazing.
Polymer coatings can be applied to a wide variety of base materials and offer long-lasting protection. They are particularly well anchored mechanically to the substrate. Additional enhancement layers allow non-stick coatings to be combined with improved sliding properties and/or high wear resistance.
With 40 years of experience in continuous reel to reel finishing, you can depend on Aalberts surface technologies to find innovative solutions that other companies might say are impossible. Our service includes barrel plating, continuous selective plating and rack plating.
Almost all metallic base materials can have their properties optimised by surface coatings using our proprietary and patented processes, regardless of whether they should be particularly hard, smooth, wear-resistant or corrosion-resistant.
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