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UNIFORM DEPOSITION

HEAT TREAT

PHYSICAL PROPERTY CHART

 

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Uniform Deposition


Chor Industries' electroless nickel coatings are used throughout the automotive, chemical, aerospace, military, petroleum, and electronics industries, among others. Applied uniformly to all surfaces, EN coatings are found on such things as nuts and bolts, turbine components, computer disks, gears, and pistons. This special coating process affords precise dimensional control of the finished product - a complete contrast to the electrolytic technique which produces much thicker deposits on high current density areas (shown above). By virtue of their unique capabilities, Chor Industries' specially-engineered EN coatings work overtime to:


  • Deliver uniform thickness
  • Offer hardness flexibility
  • Increase corrosion resistance
  • Improve uniform appearance
  • Add solderability and weldability
 


Autocatalytic vs Electrolytic

Illustration on the left depicts uniform coating of the autocatalytic process. On the right electrolytic plating has produced an uneven deposit, with build up up particularly on the shoulders and minimal deposit in the bore.




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Heat Treat

 

 


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Electroless Nickel Property Guidlines

Physical Properties

Low

Medium

High

Phosphorus Content

(% by weight)

1-4

5-9

10+

Melting Temperature Range °C

1090

980

870

Melting Temperature Range °F

2000

1600

1600

Coefficient of Expansion

um/m/°C

15

13

11

Thermal Conductivity

cal/cm/sec/°C

.015

.013

0.011

Electrical Resistivity

microhm-cm as plated heat treated, 750° F, 1 hr

15 to 30

40 to 70

80 to 110

Magnetic Properties

Magnetic

Slightly

magnetic

Non-

magnetic

Hardness

Rockwell Rc

 

 

 

 

 

 

as plated

53-59

47-53

43-49

heat treated

63-69

63-69

63-69

Vickers

 

as plated

575-675

500-600

400-500

heat treated

900-1000

900-1000

900-1000

Wear Properties

Felex Wear Test mg wt. Ioss

10

16

24

Corrosion Related Properties

Salt Spray Test*

95P F, 5% NaCI, 1.0 mill deposit:
hours to first corrosion spot
(1010 carbon steel)

48 Hours

96 Hours

1000 Hours*

 


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500 Robbins Avenue Troy, Ml 48083-4514
Phone: (248) 585 3323
Fax: (248) 585 3397

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