1. Industrial machines and equipment
  2. Surface Treatment
  3. Sulfuric anodizing
  4. SGI - Société de Galvanoplastie Industrielle

Sulfuric anodizing
aluminumindustrialfor the food industry

sulfuric anodizing
sulfuric anodizing
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Type of substrate
industrial, for the food industry, automotive, for cosmetics
Production method
large series, medium series, small series, individual
EN 12 373-1, EN 12 373-18, EN 12 373-2 / 17, EN 2284, ISO 9227-NSS


The duration of treatment is 20 to 60 min, the thickness of the oxide film obtained depends on the chemical composition of the alloy and varies according to the application sought and the industrial sector concerned. It is usually 5 to 25 µm. The treatment leads to a swelling equivalent to 33% of the thickness of the film and a slight increase in the surface roughness. The oxide layer is mainly composed of a porous structure. Sealing treatment by hydration of the porous layer is necessary to achieve the maximum corrosion resistance, but paint adhesion decreases significantly. It is possible to colour the coating, a bright metallic colour is obtained by chemical colouration: black, red, blue or green. Electrolytic colouring, by the deposit of a mixture of oxides and metals, produces shades of gold, bronze and black that are very solid under light. The colouring operation is located before the sealing. Appearance: metallic grey Thickness: 5 to 25 µm Microhardness: 200 / 250 Hv 0.050 Surface condition: slight degradation of the roughness Electrical insulation: 500 to 1500 volts Coefficient of friction: good under medium load Reduction in fatigue: 5 to 40 % in alternating traction, depending on the alloy, may be offset by prior shot peening Corrosion resistance: - without sealing: > 100 h (BS ISO 9227 NSS) - sealing with nickel salt: > 300 h - sealing with chromium VI salt > 500 h


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.