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Technical Advisor
Metal Surface Treatment
A technological process in which a layer of another material is applied to the surface of the base material or the physical-chemical properties of the surface are changed to increase corrosion resistance, improve mechanical properties (hardness, lubricity), ensure electrical conductivity, or achieve the desired aesthetic appearance.
Technological Overview of GALMM Surface Treatments
Comparison of 6 technologies — choose the right one for your part
Technology
Characteristics
Specification
Corrosion Resistance
Uniformity
Main Applications
Zinc Plating (Zn) hanging processing
Characteristics
Electrolytic zinc for universal steel protection
Specification
blue
yellow
transparent
Corrosion Resistance
96 h. RC
264 h. RC
264 h. RC
Uniformity
high
(alkaline process)
Main Applications
fasteners, hinges, stampings, holders
Zinc-Nickel (Zn-Ni) hanging processing
Characteristics
Alloy protection for extreme corrosive and thermal environments
Specification
transparent
black passivation
Corrosion Resistance
720–1008 h. RC
Uniformity
very high
Main Applications
brake systems, engine parts, chassis
KTL Coating
Characteristics
Electrophoretic dip coating for protection even in cavities
Specification
Black electrophoretic coating
Corrosion Resistance
60 cycles
Uniformity
excellent
(penetration)
Main Applications
axle housings, cross members, arms, castings
Powder Coating
Characteristics
Electrostatic powder for mechanical and UV resistance
Specification
RAL shades, various textures
Corrosion Resistance
60 cycles
Uniformity
medium
(thick layer)
Main Applications
body panels, machine covers, rims
Tin Plating (Sn) hanging / barrel
Characteristics
Tin layer for electrical conductivity and solderability
Specification
Glossy and matte tin
Corrosion Resistance
not defined – no requirement
Uniformity
high
Main Applications
busbars, contacts, consumer electronics
Phosphating hanging / barrel
Characteristics
Crystalline layer for lubricity or paint adhesion
Specification
Zinc phosphate (ZnPh)
Manganese phosphate (MnPh)
Corrosion Resistance
6 h. RC
48 h. RC
Uniformity
precise
(copies surface)
Main Applications
gears, pistons, paint base
For galvanic and alloy zinc plating at achieved 8 µm RC (red corrosion) — corrosion of base material (DIN ISO 19598). High-temperature coating — resistance up to 300 °C. KTL coating 60 cycles (min. 45 µm), powder coating 60 cycles (min. 80 µm); 1 cycle = 24 hours.