Performance comparison of various coatings on piston rods

Type of coating

Coating hardness HV

Wear resistance state

Salt spray test (hours)

Material utilization

Equipment complexity

Single layer chromium

700-1000

Wearable

48-96

20-30

generally

Milky white chromium + chromium

700-1000

Wearable

96

18-25

More equipment

Three layers of chromium

700-1000

Wearable

96-192

18-25

More equipment

Single layer nickel + chromium

700-1000

Abrasion resistance, good binding force

96-128

25-35

More equipment

Double nickel + chromium

700-1000

Abrasion resistance, good binding force

96-192

20-30

Complex process

Electroless Nickel

500-700

More wear-resistant

48-96

40-60

Simple equipment

Electroless nickel + chromium

700-1000

Wearable

96-192

30-50

generally

Tungsten alloy Coating

500-650

Wearable

48

65

Complex equipment

Nickel-iron-cobalt coating

550-700

Wearable

96

70

generally

Nickel-cobalt-iron Coating (Nano)

650-750

Super wear-resistant

Greater than 192

85

generally

Cobalt Phosphorus Coating

550-700

Wearable

Greater than 192

80

generally

Thermal spray ceramics

1000-1300

Wearable

Greater than 192

90

Complex equipment

Nano chromium coating

900-1300

Super wear-resistant

Greater than 500

30-50

Pulse power

Dw-032 high efficiency chrome plating

900-1300

Super wear-resistant

Greater than 750

70

Ordinary equipment

Structured chrome plating

800-1000

Wearable

Greater than 300

25-40

Complex equipment