Item | Surface Treatment | Feature | Application |
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1 | Anodize ( Black /Clear) | Good for tight tolerance parts: will not change dimensions Corrosion protection Good for Bonding Non-Conductive | Boric-Sulfuric Acid Anodize Applications: Precision Machined Components Aerospace/Aircraft Components As a paint/prime base
Sulfuric Acid Anodize Applications: Optical components Hydraulic valve bodies Military weapons Computer and electronic enclosures Mechanical hardware |
2 | Hard anodize ( Black /Clear) | Improved wear resistance Non-conductive Can repair worn surfaces on aluminum Improve parts surface for slide applications Can be black dyed; other colors less decorative Finish is harder than tool steel Can be ground or lapped | Valves Pistons Sliding Parts Hinge Mechanisms Cams Gears Swivel Joints Insulation Plates Blast Shields |
3 | Chromate | Tight-tolerance features | Grounding paths for electronic components Paintable surfaces for prime or dry-film lubricants |
4 | Passivation | Stainless steel does not have to be plated to achieve maximum corrosion protection. Provides a superior clean surface No rust discoloration of the stainless steel when in service. Passivated stainless steel will not react with other materials because of iron contamination. | Mixers, tanks, handling equipment, shielding, and fasteners and aerospace fuel system controls |
5 | Polish | Invasive surgical instruments and medically-invasive surgical instruments and bone plates. Removes impurities inherent in the machining/bending/welding process Relieves stresses in the part imparted by coldworking or machining | Medical implants & devices Food processing & handling equipment Pharmaceutical/laboratory equipment Gears & splines |
6 | Electroless nickel plating | Corrosion resistance Wear resistance Uniform coverage throughout part Tight control of deposit thickness No post machining needed | Valves Pumps Splines Gears Hydraulic Pistons Molds Cutting Knives |
7 | Zinc plating | Corrosion resistance Wear Resistance Appearance Lubricity Solderability | Military weaponry Medical diagnostic instruments Optics Tools and dies Aircraft components Machine components Electronics & computer devices Enclosures, chassis and heat sinks Mechanical assemblies |
8 | Chrome | Improved wear resistance Non-conductive Can repair worn surfaces on aluminum Improve parts surface for slide applications Can be black dyed; other colors less decorative Finish is harder than tool steel Can be ground or lapped | Valves Pistons Sliding Parts Hinge Mechanisms Cams Gears Swivel Joints Insulation Plates Blast Shields |
9 | Hard chrome | Corrosion resistance Wear Resistance Appearance Lubricity Solderability | Military weaponry Medical diagnostic instruments Optics Tools and dies Aircraft components Machine components Electronics & computer devices Enclosures, chassis and heat sinks Mechanical assemblies |
10 | Silver plating | Corrosion resistance Wear Resistance Appearance Lubricity Solderability | Military weaponry Medical diagnostic instruments Optics Tools and dies Aircraft components Machine components Electronics & computer devices Enclosures, chassis and heat sinks Mechanical assemblies |
11 | Gold Plating | Corrosion resistance Wear Resistance Appearance Lubricity Solderability | Military weaponry Medical diagnostic instruments Optics Tools and dies Aircraft components Machine components Electronics & computer devices Enclosures, chassis and heat sinks Mechanical assemblies |