Electroless Nickel (Mid / High Phosphorous)
Electroless Nickel plating (ENP) is just as durable and corrosion resistant but has a nickel-phosphorus coating that leaves a glossier finish and sturdy texture. This process is completed without the electric current that is commonly used in electroplating.
ENP is used to provide uniform coatings on complex shapes, to improve wear and/or corrosion resistance, and/or to improve solderability on or for selected material. It is suitable for temperatures up to 1,000°F, although wear and corrosion resistance may degrade as temperatures increase.
We provide ENP service for most construction, electronics, engineering, oil & gas industries per MIL-C-26074 and ASTM B733 ~ the most widely recognized and long-standing specifications pertaining to Electroless Nickel plating.
Electroless Nickel Plating Specifications
MIL-C-26074
ASTM B733
Type | Type I: No requirement of Phosphorous Type II: 1-3% phosphorous (low Phosphorous) Type III: 2-4% phosphorous (low Phosphorous) |
Type IV: 5-9% Phosphorus | |
Type V: 10% and above Phosphorus |
Service Condition | SCO: Minimum thickness .000004” (0.1 um) |
SC1: Light Service .0002” (5 um) | |
SC2: Mild Service .0005” (13um) | |
SC3: Moderate Service .001” (25 um) | |
SC4: Severe Service .003” (75 um) |
Class 1 – As deposited no heat treatment Class 2 – Heat treatment at 250* to 400* C to produce a Minimum hardness of 850 HK100 Class 3 – Heat treatment at 180* to 200* C for 2 to 4 hours to improve coating adhesion and to provide hydrogen embrittlement relief Class 4 – Heat treatment at 120* to 130* C for at least 1 hour of heat treatable (age-hardened) aluminum alloys and carburized steel to increase adhesion Class 5 – Heat treatment at 140* to 150* C for non age-hardened aluminum alloys and beryllium to improve coating adhesion Class 6 – Heat treatment at 300 to 320°C (572-608°F) for at least 1-hr to improve coating adhesion for titanium alloys. |
