Surface treatment – an alternative to stainless steel

Jon Lawson

The nsd tupH surface treatment offered by Nord Drivesystems is an outstanding anti-corrosion treatment for gear units, smooth motors, frequency inverters and motor starters in washdown-optimised cast aluminium housings. Applying a special method, the surface is made corrosion-resistant and harder; in this way, aluminium behaves like stainless steel with regard to corrosion protection. This is not a coating, but the surface treatment creates a protective layer which is permanently bonded to the substrate material. In contrast to painting or coating, nothing can detach or flake off. Damages remain locally restricted and do not propagate. The surface is easy to clean and largely resistant to acids and alkalis. It is even possible to use high pressure cleaners or a great variety of aggressive media.

nsd tupH drive units are a robust and durable alternative to painted geared motors or stainless steel versions. In contrast to stainless steel drives offered by only a few manufacturers and in only few variants, the nsd tupH surface treatment is available for almost all Nord aluminium products. For nsd tupH aluminium drive units, all DIN and standard components, including drive shafts, are made from stainless steel. The fanless smooth motors do not spread germs and run very quietly. They are available as synchronous and asynchronous motors and comply with efficiency classes IE2 and IE3 (asynchronous motors) and IE4 (synchronous motors).

Nord drives with nsd tupH comply with FDA Title 21 CFR 175.300 and for this reason are suitable for food application. They have been successfully tested according to ASTM D714 (blistering, ASTM D610-08 (corrosion), ASTM D1654-08 according to DIN EN ISO 2409 (scratching), ASTM B117-09 according to DIN EN ISO 9227 (salt spray test) and ASTM D3170 (Gravelometer). In addition, their resistance to common cleaning agents which are used in the food industry has been confirmed in tests.

The nsd tupH surface treatment is advantageous for all drives used under extreme environmental conditions and for hygienically critical applications. This also includes the beverage and food industry, water treatment and sewage plants as well as offshore and onshore applications.


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