Surface Finishing Tutorial
#228 Grades for Nickel Plating and Nickel-Chrome Plating
Category : Electroplating
February26, 2016
This standard defines the plating thickness, corrosion-resistance properties, and types of plating applied on various substrates, including copper/steel base metal, in order to add anti-corrosion properties and/or decorative finishes. (The corrosion resistance properties are described in another section.)
[Table 1] Types, grades, and symbols for copper-nickel plating and nickel plating
Basis metal |
Plating type |
Grade |
Minimum plating thickness (µm) |
Symbol |
Steel |
Copper-nickel plating |
Grade 1 |
3 |
EP-Fe/Cu+Nib3 or EP-Fe/Cu+Nib [1] |
Grade 2 |
5 |
EP-Fe/Cu+Nib5 or EP-Fe/Cu+Nib [2] |
Grade 3 |
10 |
EP-Fe/Cu+Nib10 or EP-Fe/Cu+Nib [3] |
Grade 4 |
15 |
EP-Fe/Cu+Nib15 or EP-Fe/Cu+Nib [4] |
Grade 5 |
20 |
EP-Fe/Cu+Nib20 or EP-Fe/Cu+Nib [5] |
Copper and copper alloy |
Nickel plating |
Grade 1 |
3 |
EP-Cu/Ni3b or EP-Cu/Nib [1] |
Grade 2 |
5 |
EP-Cu/Ni5b or EP-Cu/Nib [2] |
Grade 3 |
10 |
EP-Cu/Ni10b or EP-Cu/Nib [3] |
|
[Table 2] Grades and symbols for nickel-chrome plating on an iron and steel substrate
Grade |
Base-coat plating |
Minimum plating thickness (µm) of base-coat plating |
Top-coat plating |
Minimum plating thickness (µm) of top-coat plating |
Symbol
(Note) |
Nib: |
Bright nickel plating |
Nib: |
Duplex nickel plating (semi-bright + bright) |
Cr r: |
Regular chrome plating |
Cr mp: |
Microporous chromium plating Chrome plating with enhanced corrosion resistance containing fine holes evenly distributed over the surface (At least 10000 holes per cm2) |
Cr mc: |
Microcracked chromium plating Chrome plating with enhanced corrosion resistance containing fine cracks evenly distributed over the surface (At least 100 cracks per cm2) |
|
Grade 1 |
Nib |
3 |
Cr r |
0.1 |
EP-Fe/Ni 3b,Cr 0.1 r or EP-Fe/Nib, Cr r[1] |
Grade 2 |
Nib |
5 |
Cr r |
0.1 |
EP-Fe/Ni 5b,Cr 0.1 r or EP-Fe/Nib, Cr r[2] |
Grade 3 |
Nib |
10 |
Cr r |
0.1 |
EP-Fe/Ni 10b,Cr 0.1 r or EP-Fe/Nib, Cr r[3] |
Grade 4 |
Nib |
15 |
Cr r |
0.1 |
EP-Fe/Ni 15b,Cr 0.1 r or EP-Fe/Nib, Cr r[4] |
Grade 5 |
Nib |
20 |
Cr r |
0.1 |
EP-Fe/Ni 20b,Cr 0.1 r or EP-Fe/Nib, Cr r[5] |
Grade 6 |
Nid |
25 |
Cr mp |
0.1 |
EP-Fe/Ni 25d,Cr 0.1 mp or EP-Fe/Nib, Cr mp[6] |
Nid |
25 |
Cr mc |
0.1 |
EP-Fe/Ni 25d,Cr 0.1mc or EP-Fe/Nib, Cr mc[6] |
Grade 7 |
Nid |
30 |
Cr r |
0.1 |
EP-Fe/Ni 30d,Cr 0.1 r or EP-Fe/Nid, Cr r[7] |
Grade 8 |
Nib |
40 |
Cr r |
0.1 |
EP-Fe/Ni 40b,Cr 0.1 r or EP-Fe/Nib, Cr r[8] |
Grade 9 |
Nid |
30 |
Cr mp |
0.1 |
EP-Fe/Ni 30d,Cr 0.1 r or EP-Fe/Nid, Cr mp [9] |
Nid |
30 |
Cr mc |
0.1 |
EP-Fe/Ni 30d,Cr 0.1 r or EP-Fe/Nid, Cr mc[9] |
|
* |
The plating thickness of semi-bright and bright plating for base-coat Nid will be determined and agreed between the parties concerned. |