TECHNICAL INTRODUCTION
Technical introduction

Technical comparison

概要:
概要:
详情

Dallogin phase diagramCrokin phase diagram

 

 

 

 

 

 

 

 

Electrostatic spraying metallographic diagramElectrostatic spraying metallographic diagram

 

 

 

 

 

 

 

 

 

Metallographic diagram of zincizingMetallographic diagram of zincizing

 

 

 

 

 

 

 

 

 

 

 

Metallographic diagram of zinc-nickel infiltration layerMetallographic 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

氢脆

Neutral salt spray test (h)

≤100

≤480

≥1000

≥240

≥500

最大6000

Sulfur dioxide resistance

Adhesive force

较好

较好

较好

较好

Hardness (HV)

180-200

70-80

2H

>250

>250

200-500

Abrasion resistance

较差

较好

较好

Appearance uniformity

较好

Mating effect

较小

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)

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

 

产品

Sample number

Diffusion layer

平均

基体

平均

HV0.025

HRB

Gauge damper

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

 

产品

Diffusion layer

平均

基体

平均

HV0.1

45钢

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

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

 

产品

Diffusion layer

平均

基体

平均

HV0.1

Type II 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)

 

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Copyright © 2020 Chongqing Dayou Surface Technology Co., LTD  
Chongqing ICP for 16005686