TECHNICAL INTRODUCTION
Technical introduction

Technical comparison

概要:

详情

Dallogin phase diagram 达Crokin phase diagram

Electrostatic spraying metallographic diagram

Metallographic diagram of zincizing

Metallographic diagram of zinc-nickel infiltration layer

Comprehensive comparison of various surface treatment technologies

Comparison item	galvanizing	Hot dipping zinc	dacromet	Powder zincizing	Multicomponent zinc-aluminum infiltration	Zinc-nickel infiltration layer
酸洗	有	有	无	有	无	无
氢脆	有	有	无	无	无	无
Neutral salt spray test (h)	≤100	≤480	≥1000	≥240	≥500	最大6000
Sulfur dioxide resistance	差	差	差	差	差	好
Adhesive force	较好	较好	差	较好	较好	好
Hardness (HV)	180-200	70-80	2H	＞250	＞250	200-500
Abrasion resistance	较差	较好	差	较好	好	好
Appearance uniformity	好	差	好	较好	好	好
Mating effect	较小	大	较小	较小	较小	较小

Note: Varies according to material and heat treatment process。

Residual stress on the surface of the elastic strip

	Residual stress at 0° (MPa)	Residual stress at 90° (MPa)
Before zinc-nickel infiltration	-49.5±4.6	-69.0±4.3
	-114.5±30.9	-81.1±27.4
	-70.0±23.0	-63.0±18.0
After zinc-nickel infiltration	-282.6±4.6	-329.8±8.5
	-195.8±7.4	-299.8±6.4
	-340.0±15.5	-294.3±19.8

Fatigue life comparison between zinc-nickel permeating layer and dacromet (Wind bolt)

Hardness of zinc-nickel infiltration layer after different materials and heat treatment states

Hot rolled mild steel (Q235) - diffused layer hardness slightly higher than matrix hardness

Hot rolled medium carbon steel (45 steel) and unquenched tempered cast iron - diffusion layer hardness slightly higher than the matrix hardness

Quenched - tempered medium carbon alloy steel - diffusion layer hardness is slightly lower than the matrix hardness

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