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Brief Information Innovative and Highly Functional Surface Designs brief information innovative and highly functional surface designs 1 content Aalberts surface treatment processes Anodizing and hard anodizing Page* Polymer coatings Page* ■■CompCote® 3 ■■HMF® - ■■Color anodizing - ■■MagnaCoat® 29 ■■HART-COAT® 5 ■■TempCote® 31 ■■HART-COAT® GLATT 7 ■■Anodizing 9 Electroless nickel plating Powder coating ■■DURNI-COAT® and variants, 11 ■■FlexiColor® 33 including PTFE-DURNI-DISP and SIC-DURNI-DISP ■■NEDOX® - Chrome and cadmium substitute Screw locking ■■IVD aluminium vacuum coating 13 ■■screw locking and 35 ■■SurTec® 650 - thread sealing Cr Cd Galvanic coatings Selective coatings (High Tech Galvanics) 15 ■■LASOX-COAT® 37 ■■Chrome (Cr)/Hard chrome - ■■SELGA-COAT® 39 ■■Copper (Cu) - ■■SELGA-COAT® CHROME - ■■DURALLOY® 17 ■■SELGA-COAT® GOLD - ■■Gold (Au) - ■■Nickel (Ni) - ■■Nickel sulfamate - ■■Silver (Ag) - ■■Tin (Sn) - ■■Zinc (Zn) 19 ■■Zinc iron (Zn-Fe) - ■■Zinc nickel (Zn-Ni) 21 Anti-friction coatings Sherardizing ■■antifricor® - ■■FuseCoat® 41 ■■GLISS-COAT® 23 ■■GLISS-COAT® FLOCK 25 Zn Cathodic dip painting 25 Thermal spraying ■■PlasmaCoat® 43 ■■Thermical spraying 45 Nanocoatings Vacuum coating ■■MIKROFINISH® - ■■Physical vapour deposition - ■■NANOFINISH® - (PVD) ■■ORMOCER® - ■■Plasma enhanced chemical - vapour deposition (PECVD) Wet painting Sealings ■■SILA-COAT® 5000 47 Plasma chemical coatings Zinc flake coating 49 ■■MAGOXID-COAT®/ KEPLA-COAT® 27 (*pages in this brochure) (All technical values published in this brochure are subject to the test conditions specified. We therefore emphasise that the applications and operating conditions, along with the end user’s practical experience, will ultimately determine the level of performance achieved by the processes.) 2 Aalberts surface treatment BRIEF INFORMATION CompCote® aluminium oxide polymer composite layers 3 CompCote® CompCote® refers to aluminium oxide polymer com- material. Due to the molecular polymer content, posite layers for aluminium alloys. The layers are CompCote® offers chemical bond bridges with a formed by anodic oxidation of the base material and coordinated choice of top-coats, providing very good simultaneous molecular compounding of the alumi- adhesion results. In general, the cross-linked layer num oxide layer with polymers. structure makes CompCote® a robust layer. CompCote® H, which is produced on the basis of a Excellent adhesion to the base material results from hard anodic oxidation (hard anodizing), is harder and the fact that the layer partially merges into the base more wear and corrosion resistant. CompCote® is excellent for coloring. Accelerated anodized layers (both layers 10 μm, colored black and weathering tests with 200 hours of UV exposure sealed). Standard colors: black, titanium grey, blue, show only 1/3 of the reduction in color and brightness red, gold, green. Other colors on request. in CompCote® compared to that of conventionally Corrosion resistance hours 3,000 CompCote® is corrosion resistant 3,000 + and outperforms normal anodic 2,500 coatings due to the presence of 2,000 molecular polymers. 1,500 1,500 1,000 + 1,000 500 450 0 Anodized Hard anodized CompCote® CompCote®-H Salt-spray Test (ASTM B117): alloy 6061 T6, anodized (MIL Typ III) 10 µm Component with blue colored / hard anodized (MIL Typ III) 37.5 µm / CompCote® layer CompCote® 10 µm / CompCote®-H 37.5 µm process details As layer hardness there is measured – as usual with anodic oxidation layers – the so called apparent Hardness hardness. Depending on the alloy and process, it is between 300 and 600 HV. In the Taber Abraser test (MIL A 8625F), CompCote® shows excellent wear resistance which can be Wear resistance even better than that of conventional anodizing layers. Flexural strength CompCote® does not affect the flexural strength of the base material. This attribute makes the layer interesting for applications in aviation. Fracture properties CompCote® produces a fibre-like fracture pattern in notch impact tests. In contrast, conventional ox- ide layers, break in a brittle manner, like glass. CompCote® roughens up the surface comparatively little and possesses an optimized microstructure. Tribological CompCote® displays very good anti-scuffing properties in various friction pairings and friction tests. properties In some cases, the coefficient of friction in repeated tests even decreases (self-smoothing effect). Stick-slip effects are reduced. A selection of Architecture, automotive industry, aviation, defense technology, domestic appliances, electrical engi- neering, food industry, hunting firearms, hydraulics, information technology, mechanical engineering, applications medical technology, packaging machines, photo and video technology, pneumatics, sporting goods. 4 Aalberts surface treatment BRIEF INFORMATION HART-COAT® hard anodizing of aluminium alloys 5 HART-COAT® The HART-COAT® process, also known as HC, is Compared to conventional anodized layers, an electrolytic treatment for aluminium substrates HART-COAT® layers are thicker and provide better during which a hard and thick aluminium oxide layer wear resistance. is formed. The essential purpose of this surface treatment is to provide protection against wear and HART-COAT® layers can be applied where properties corrosion as well as further functional improvements like corrosion resistance, wear resistance, dimen- to components from almost all industrial sectors. sional accuracy, anti-friction properties or insulation are required for aluminium substrates. HART-COAT® The process corresponds to ISO 100 74. HART-COAT® layers show a good adhesion to the base material. layers are built up by anodic oxidizing in a specially Nearly all wrought, cast and die-cast aluminium alloys formulated, cold, acidic electrolyte. By means of elec- destined for industrial use are suitable for treatment tric current, a protecting aluminium oxide layer is pro- with HART-COAT®. duced on the surface of the workpiece being treated. Wear in µm 80 80 Al 99 70 70 EN AW-7022 (AlZn5Mg3Cu) 60 60 50 50 St 37 40 40 30 30 Hardened Hard chrome 20 20 Steel HART-COAT® 10 10 HART-COAT® This schematic scene of a cross section GLATT 0 0 of a 50 µm thick HART-COAT® layer 0 20 40 60 80 100 (HC layer) shows that 50 % of this Rotations in thousand conversion layer grow into the substrate and 50 % outwards. In case of HART-COAT®-GLATT (HC-GL) there is a Wear behaviour of HART-COAT® layers Winch coated with HART-COAT®. 2/3 penetration and 1/3 build-up. com pared to other materials (Taber Abrasion measurements, abrasive wheel CS 17, load 10N) HC HC-CU HC-GD HC-GL Suitable materials for wrought aluminium for aluminium alloys for die-cast aluminium for wrought, cast and alloys as well as sand and with a high copper alloys with high copper die-cast aluminium permanent mold cast content and/or silicon content alloys with limited (2 % to 6 %) copper, silicon and lead content Application pneumatic and hydraulic guide pulleys, pistons, housings, guide cyl- for components cylinders, compressor nozzles, valves, roller inders, guide plates, requiring an espe cially wheels, lifting gear, bearings, centrifuges, mounting plates, smooth and wear- insulator spacers, hot- camera components, clothes iron plates, resistant surface plates, screw conveyors, bearing shells, cam damping chambers, spacers, clamping and plates, levers, pulleys, gears and rack drives, retaining mechanisms, coils clutch components, cylindrical tubes, rocker cylinder heads arms, surgical instruments Layer properties high wear resistance, improved corrosion resistance, improved hardness, optimum anti-friction depending on alloy properties, optimum adhesion, high thermal insulation, high electrical insulation, good dimensional accuracy, resistant to temperature, suitable for consumer goods, food compatible 6 Aalberts surface treatment BRIEF INFORMATION HART-COAT® GLATT hard anodizing of aluminium alloys especially smooth and wear resistant 7 HART-COAT® GLATT The process: Anti-friction characteristics: HART-COAT® or HC to be short is an hard anodic The coefficient of friction of HC-GL determined in an oxidation which protects aluminium materials against anti-friction test carried out with a pin-disc-tribometer wear and corrosion with a hard ceramic-like layer. had an average value of 0.73 (FN = 5 N; v = 6 m/min; HC-GL is a process variant of HART-COAT® whose 9,000 revolutions). result is the forming of very smooth and very wear- Wear resistance: resistant layers onto aluminium materials. HC-GL Performance with regard to abrasive wear is especial- coatings are obtained through anodic oxidation in ly good. Results of the Taber Abraser measurements a specially formulated cooled, acid electrolyte. This can be seen in the diagram on page 6 (brief informa- type of coating has an extremely low pore volume and tion HART-COAT®). pore diameter compared to the protective coatings obtained with conventional anodizing processes. The designer has to bear in mind, that the dimensions of a component only change by 1/3 of the total layer thickness. Base materials for the HC-GL coating: HC-GL surface coatings can be used wherever corro- sion protection, wear resistance, dimensional accuracy, anti-friction properties or insulation is required for alu- minium materials. HC-GL layers distinguish themselves for a good adhesion on the base material. Nearly all HART-COAT®-GL coated (25 μm) lever and knife carrier for wrought, cast and die-cast aluminium alloys destined asparagus peeling machine. The layer protects here against corrosion and provides improved cleaning and wear properties. for industrial
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