PRODUCT REVIEWS
Etching , pickling and burnishing
With the burnishing gels of its Nigrit series , Emil Otto GmbH is expanding its portfolio in the application area of etching , pickling and burnishing . Like the liquid variants , the gels can be used for cold burnishing , marking and blackening on a wide range of metals and alloys as well as high-alloy stainless steels . To create a black colouration or permanent marking on metallic surfaces , the German metal chemistry specialist offers a range of different burnishing agents which are now also available for individual formulations as viscous gels .
“ With the previous liquid burnishing agents , larger surfaces can be processed reliably and quickly . The new gels , on the other hand , allow for pinpoint processing of the workpiece to be treated . Since the gel does not run , it works exactly where the employee has applied it ,” explained Markus Geßner , responsible for marketing and sales at Emil Otto GmbH . This precision direct dosing is especially important when component surfaces have to be processed that actually have to be removed for burnishing or blackening . “ This step is no longer necessary ,” Geßner confirmed .
The Nigrit gels are available for various metal surfaces . In addition to stainless steel , aluminium , iron , steel , copper and brass , bronze can also be processed . When the workpieces are processed , black mixed oxide layers are formed that protect the surface . These can also serve as corrosion protection for iron , steel and stainless steel . The layers created by burnishing are resistant to bending and abrasion , which
makes subsequent further processing of the metal possible . The layer can only be removed mechanically .
“ Depending upon the material , relatively quick blackening occurs approx . 5-30 seconds after application . If the workpiece remains in contact with the Nigrit gel for longer , loose oxides accumulate on the surface and are removed after the process ,” Geßner continued .
To remove these oxides , Emil Otto offers Neutrasol , a product developed specifically for this purpose . Afterwards , the workpiece must be dried and preserved . Emil Otto also has a suitable product for preservation in its range . The after-treatment fluid is temporarily effective , preserving metal protection that can be applied thinly after the gel has been used . All burnishing agents , whether in liquid or viscous form , are intended for immediate use in metal processing .
Emil Otto was founded in Magdeburg , Germany , in 1901 . As an owner-managed company , it is committed to the development and manufacturing of fluxing agents for electronics production , strip tinning , cooler construction as well as for galvanizing . It supplies various
Nigrit series gels .
sectors of the metalworking industry . The most important areas of application include etching , pickling and burnishing with a focus on marking and inscribing metallic surfaces . One of its best-selling products is a metal etching pen that can be used in a similar way to a ballpoint pen and can be filled with , among other things , burnishing agents from the Nigrit series . Using the pen , it is possible to easily mark and label metals and their alloys . These are permanent and lasting and can only be removed by mechanically processing the surface .
“ We can process the surfaces on stainless steels as well as titanium , copper , brass , bronze or even aluminium with our Nigrit solutions ,” Geßner continued . The burnishing solutions can also be used to colour workpieces black and provide them with a surface protection that prevents oxidation . Depending on the metal , different Nigrit solutions are used . For weld seam testing , Emil Otto offers the Adler etching solution . This is applied to the weld to be able to detect cracks or structural weak points . The company also offers various fluxes for the production of radiators and various products for the strip tinning of large metal strips made of copper or other alloys .
Emil Otto also supplies the tool and machine-building industry with chemical products such as marking inks , spotting pastes , rust removers or derusting agents . Marking inks and spotting pastes are also available in combination with alcohol- or water-based cleaning agents . n
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