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#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.

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