Thursday, June 10, 2010

Hardness Chrome Plating Recommended

Hard Chrome Plating to materials is proposed to high shear between plated materials and other material close to. Hard chrome can use either to avoid of plating damage when use or to avoid of high shear between materials. Hard chrome is applied to materials that always shear each others like on piston and hydraulic axe. Sometime certain materials are not just need of hard plating but must have smooth surface to avoid of oil seal leakage through the smooth hole that is available on the shaft like piston. If materials do not plate with chrome there are smooth hole on steel surface, but after plating the smooth hole will cover and filled by chromium.

The success of chromium plating in industrial applications may probably be attributed to its unique combination of properties not possessed by any other one material available commercially. The most important of these are hardness, adhesion, corrosion resistance, non-galling and non-wetting qualities, and low coefficient of friction. In many instance all these properties are important for successful commercially applications.

Hardness alone would not sufficient to secure widespread use, because a number of other hard materials or hardening process are available. It is combination of very great hardness and good corrosion resistance, and very low coefficient of friction or unique surface qualities.

Recommended hardness on application and other application are listed on the table below:

Application
Recommended Hardness
Plating Thickness, μm
Drills
62 – 64
1.3 – 13
Reamers
62 – 64
2.5 – 13
Burnishing bars
60 – 62
13 – 75
Drawing Plug or mandrels
60 – 62
38 – 205
Drawing dies
62 inside,
45 outside
13 – 205
Plastic moulds
55 – 60
5 – 50
Gages
48 – 58
2.5 – 35
Pump shafts
55 – 62
13 – 75
Rolls and drums
6 – 305
Hydraulic rums
13 – 100
Engraved steel
5 – 13

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