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TECHNICAL INTRODUCTION

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Dacromet metallographic figureDacromet metallographic figure

 

 

 

 

 

 

 

 

Electrostatic spraying metallographic figure

Electrostatic spraying metallographic figure

 

 

 

 

 

 

 

 

 

Zinc impregnation metallographic figureZinc impregnation metallographic figure

 

 

 

 

 

 

 

 

 

 

 

Zinc-nickel infiltration layer metallographic figureZinc-nickel infiltration layer metallographic figure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Comprehensive Comparison of Various Surface Treatment Technologies

Comparative Item

Cold Galvanizing

Hot-Dip Galvanizing

Dacromet

Powder Zinc Impregnation

Zinc-aluminum Multi-Component Thermochemical Treatment

Zinc-nickel Infiltration Layer

Acid Pickling

Yes

Yes

No

Yes

No

No

Hydrogen Embrittlement

Yes

Yes

No

No

No

No

Neutral Salt Spray Test(h)

≤100

≤480

≥1000

≥240

≥500

Maximum6000

Sulfur Dioxide Resistance

difference

difference

difference

difference

difference

Good

Adhesive Force

Better

Better

Difference

Better

Better

Good

Hardness(HV)

180-200

70-80

2H

>250

>250

200-500

Wear Resistance

Poorer

Better

Difference

Better

Good

Good

Appearance Homogeneity

Good

Difference

Good

Better

Good

Good

Cooperation Influence

Less

Gig

Less

Less

Less

Less

NOTE: Vary depending on the material and heat treatment process.

Elastic strip surface residual stress

 

0 ° direction residual stress(MPa)

90°direction residual stress(MPa)

Before zinc-nickel infiltration layer

-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 layer

-282.6±4.6

-329.8±8.5

-195.8±7.4

-299.8±6.4

-340.0±15.5

-294.3±19.8

Comparison of zinc-nickel infiltration layer and Dacromet fatigue life (wind power bolt)

1

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

Hot-rolled low carbon steel (Q235) – diffusion layer hardness is slightly higher than substrate hardness 

 

Product 

Sample No.

Diffusion Layer

Average

Matrix

Average

HV0.025

HRB

Gauge Apron

1

200 208 189

199

65.5 65.0 66.0

66.0(130HV)

2

198 232 215

215

67.0 65.5 65.0

66.0(130HV)

3

232 203 232

222

70.5 69.5 66.5

69.0(135HV)

4

196 189 173

186

67.0 67.5 70.0

68.0(135HV)

Screw Spike

1-1

271 283 247

267

82.0 81.5 82.0

82.0(170HV)

1-2

251 232 241

241

80.0 80.0 79.0

79.5(165HV)

2-1

226 215 221

221

82.5 81.5 82.0

82.0(170HV)

2-2

208 215 205

209

80.0 81.0 79.0

80.0(165HV)

Hot-rolled Mmedium carbon steel (45 steel) and non-quenched and tempered cast iron – diffusion layer hardness is slightly higher than the substrate hardness

Product 

Diffusion Layer

Average

Matrix

Average

HV0.1

45 Steel

351 374 353 351 356

357

276 274 271 270 276

273

QT400-15

325 325 321 320 327

324

232 238 230 235 238

235

Quenching - carbon alloy steel in tempering - diffusion layer hardness is slightly lower than substrate hardness

Product 

Diffusion Layer

Average

Matrix

Average

HV0.1

Ⅱ-type elastic strip(60Si2CrA)

433 429 436 414 429

428(44.0HRC)

468 460 468 464 456

463(46.5HRC)

Wind power bolt(42CrMoA)

338 328 331 346 344

337(36.5HRC)

375 352 378 346 357

362(39.0HRC)

321 311 326 326 314

320(35.0HRC)

358 354 344 346 354

351(38.0HRC)

366 346 352 375 362

360(39.0HRC)

358 357 360 366 378

364(39.5HRC)