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Electroless Nickel Plating

 
Electroless Nickel Plating
Electroless Nickel Plating
Electroless Nickel Plating
Electroless Nickel Plating
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Our Company and its activities :
 
Specialists in Electroless Nickel Plating

PEPCOAT ” is the trade name of our quality phosphorus- Nickel metal alloy coating. We undertake coating of customer parts ranging from small fasteners to large rollers and Chemical Equipment.

PEPCOAT :-
A New and unique Engineering Plating Chetana is a Job shop where we do Electroless Nickel plating on customer parts equipment, We are the pioneers in this field and besides being the most experienced, have one of the largest plating facilities in India.

Our plating – called “ PEPCOAT ” and technically known as Electroless Nickel – is an unusual plating because it does not have the handicaps of conventional Electroplating, and offers the following :
Electroless Nickel Plating
 
Advantages:
  • Totally uniform plating thickness on the entire part
  • plating thickness that can be controlled in micron tolerances
  • Grinding after plating  not required because of uniform plating thickness
  • Plating can be done on any metal
  • HCHCr S. S. Gun metal, Copper, Brass etc.
 
PEPCOAT ”  has a unique combination of engineering properties and is widely used for :
  • Superior corrosion protection
  • High surface hardness -48 HRC to 62 HRC
  • Excellent wear resistance- reduces friction
  • Non – sticking, self- polishing surface
  • Stability
 
Typical parts Routinely plated with PEPCOAT are :
  • Plastic Moulds
  • Spider spiral
  • Valves- Ball, Butter fly
  • Pumps – Impellers, casing
  • Piston rods  
  • Textile parts- Thread rollers
  • Mismachined and worn parts for salvage
  • Extruder Screw
  • Die/ Punch
  • Gate  Valve seats
  • Hydraulic and Pneumatic and shaft, bushes cylinders
  • Pharma and Food Machinery
  • Complicated parts Thread guides that cannot be electroplated
 
There are probably a number of applications where our plating can be of use to you. Write to us for our Technical Bulletin describing " PEPCOAT " in details.
 
Chetana Capacitor is a job shop where we do Electroless Nickel Plating on customer parts / equipment. We are the pioneers in this field and besides being the most experienced, have one of the largest plating facilities in India.
 
About our facility
 
We are a quality process house for Electroless Nickel Plating.
 
• With technical know how from Elnico.
• One of the largest process house in India.
• Can handle jobs up to 1500 mm in length and up to 1.5 Tons by weight.
• Thickness testing instrument.
• Can check various other qualities of the deposit such as bonding, porosity, nitric acid test etc.
Features at a Glance :
 
• Totally uniform plating thickness on the entire part without any limitations of complexity of the component
• Plating thickness can be controlled in micron tolerances.
• Grinding after plating is not required because of it’s uniformity in the deposit.
• Can be done on practically all metals.
Advantages at a Glance :
 
• Superior corrosion protection
• High Surface Hardness
• Excellent wear resistance
• Non sticking – Self polishing surface
• Consistency in deposit characteristics.
Electroless nickel plating is an alloy of nickel and phosphorous.
There are three types of Electroless Nickel Coatings available depending on the phosphorous content in the deposit namely…
 

• Low Phosphorous Electroless Nickel
• Medium Phosphorous Electroless Nickel
• High Phosphorous Electroless Nickel

 
Applications
" PEPCOAT " is a functional engineering coating with a unique and unusual combination of properties.
It is commonly used for a number of different, but often complementary reasons, such as to:

PROVIDE SUPERIOR CORROSION PROTECTION …
The phosphorus – nickel deposit is resistant to attack by almost all chemicals except strong oxidizing acid and salts.

" PEPCOAT " is superior to electrolytic nickel, especially in outdoor exposure, because of its perfect coating coverage, low porosisty, uniform thickness, and amorphous deposit.
 
 
Technical Information on Electroless Nickel Plating
 
Our plating - called 'Pepcoat' and technically known as Electroless Nickel - is an unusual plating because it does no require electrical current for deposition. Hence it does not have the handicaps of conventional Electroplating, and offers the following advantages :

• Totally uniform plating thickness on the entire part
• Plating thickness that can be controlled in micron tolerances
• Grinding after plating not required because of uniform plating thickness
• Plating can be done on any metal
• HCHCr S.S. Gun metal, Copper, Brass etc.
PEPCOAT has a unique combination of engineering properties and is widely used for :

• Superior corrosion protection
• High surface hardness - 48 HRC to 62 HRC
• Excellent wear resistance - reduces friction
• Non - sticking, self - polishing surface
• Stability
Typical parts routinely plated with PEPCOAT are

• Plastic Moulds, Extruder Screw, Spider spiral, Die/Punch
• Valves - Ball, Butterfly, Gate Valve seats, Pumps - Impellers, castings, and shaft, bushes
• Hydraulic and Pneumatic cylinder, Piston rods, Pharma and Food Machinery
• Textile parts - Thread rollers, Thread guides
• Complicated parts that cannot be electroplated
• Mismachined and worm parts for all salvage
 
Comparion Data
PEPCOAT
HARD CHROME
ELECTRO-PLATING NICKEL
TRUCTURE HARDNESS AS DEPOSITED
500 - 550 VHN

Amorphous deposit with
micro crack network 1000-1100 VHN

Crystalline Porous
Crystalline 160-180 VHN
HEAT TREATED
Over 1000 VHN
-------
------
WEAR RESISTANCE
Excellent
Excellent
Poor
CORROSION PROTECTION
Excellent
Poor beam of micro
Good
THROWING POWER
Infinite
Very Poor
Fair
UNIFORMITY OF DEPOSIT
Excellent
Very Poor
Fair
POST FINISHING
None
Essential
------
LIMITATION ON OBJECTS
None
Yes, Severe Limitation
Yes
 
Areas of Applications
 
Chemical
Petroleum
Automobile
Marine-Sea Water
Food Processing
Dairy Equipments
Textile
Printing
Pharmaceutical
Medical
Electronics
Computer
Moulds & Dies
Aerospace
 
Appearance
 
The coated surfaces of the Base Material shall be free from visible defects, such as blisters, pits, roughness, cracks, or un-coated areas.
 
The Chemical Composition shall conform to the following :
 
Element -Percent Minimum         Maximum
Phosphorus 10.0 11.0 
Nicke 90.0 ----
All  Other ---- 0.05
 
Hardness
In the “ As Coated “ condition,without Heat Treatment, the Micro-hardness of the depoit shall be 48 Rc, The Hardness of the deposit shall be measured n accordance with ASTM Standard B578, “ Measurement of Micro-hardness of Electoplated Coating”, using a load of 100 Grams and Vickers Diamond hidentor.
 
Adhesion
The coating shall be sufficiently adherent to, the Base Metal to pass two (2) or more of the following adhesion tests.

Bend Test For Adhesion : A coated  sample or article shall be bent, with its* coated surface away over a Mandrel until its” two legs are parallel.Examination shall reveal no evidence of peeling or flaking. Also it shall not be possible to detach or lift the coating from the Base Metal with a sharp instrument (pic.1) Burnishing Test for Adhesion : An area of the coated sample or article, approximately 0.5 inches in diameter, shall  be rubbed rapidly and frimly for fifteen (15) seconds with a smooth metal implement
Blisters, lifting, or blisters in and around the indentations are evidence of inadequate adhesion.

Information on other tests for coating adhesion is given in ASTM Standard Test Methods B571, “Adhesion ol Metallic Coatings”
Adhesion ol Metallic Coatings
 
Porosity
 
The coating shall be free of porosity, cracks or other defects which would allow access of a corrosive environmen to the Base Metal, and shall pass one (1) or more of the following tests for
porosity. Boiling D.I. Water Test for porosity: A coated sample shall be immersed in boiling de-jonized water for five (5 minutes. This  test is Most suitable for thin deposits.
HC1 Test for porosity: A coated sample shall be immersed in a 50% solution of Hydrochloric Acid (One part concentrated acid to one part water) at ambient temperature (65* F to 75 *) for two (2)minutes. This Test is not suitable for thin deposits on Mild Steel Base Metal. Coating on Low Alloy Steels, such as SAE 4140 cannot be evaluated by this method. (pic.2) Ferroxy Test for porosity : A coated sample, after cleaning, shall be immersed in Ferroxy Solution (25 Grams of potassium Ferricyanide plus 15 grams of Sodium Chloride in one (1) liter of water) at ambient temperature (65* F to 75*F) for thirty (30) seconds. Sharply defined blue spots or streaks on the paper are evidence of porosity.
Adhesion ol Metallic Coatings
 
Corrosion Resistance
The deposit shall pass the following:
Nitric Acid Test : The deposit, when applied on a Sample at a thickness of 0.1 Mil., shall with stand
an immersion
in concentrated Nitric Acid at 65*F to 75* F  for thirty (30) seconds without any significant black discoloration. (pic. 3)