Effect of a laser quenched substrate on the surface morphology of Cr-plating coatings
-
1.
Department of Mechanical & Electrical Engineering, Jianghai Polytechanic College, Yangzhou 225101, China
-
Received Date:
2011-03-28
Accepted Date:
2011-04-15
-
Abstract
In order to discover the effect of a laser quenched substrate on the surface morphology of Cr-plating coatings, the substrate was quenched by laser discretely and then Cr-coatings were plated on the surface. There appeared periodical strips alternating with dense and loose ball-like microstructure on the surface morphology in accordance with discrete substrate. The dense and loose strips correspond with original and laser quenched zone respectively. With the help of high resolution scanning electron microscope, the chemically-etching substrate and ion etching methods were used to analyze the microstructure morphologies on the Cr-coating interface and along the thickness direction respectively. The results show that the mechanism of the periodical morphological formation of Cr-coating is that the substrate discrete characteristic is transferred to coating surface by means of the periodical characteristic of coating interface and differential Cr-coating growth mode.
-
-
References
|
[1]
|
SOPOK S,RICKARD C,DUNN S.Thermal-chemica-mechanical gun bore erosion of an advanced artillery system part one:theories and mechanisms[J].Wear,2005,258(1/4):659-670. |
|
[2]
|
SOPOK S,RICKARD C,DUNN S.Thermal-chemical-mechanical gun bore erosion of an advanced artillery system part two:modeling and predictions[J].Wear,2005,258(1/4):671-682. |
|
[3]
|
CHEN G N,LUO G X,ZHANG K,et al.A new method for improving service life of chrome-plated gun barrels by laser strengthening[J].Acta Armamentaria,2003,24 (s1):6-10( in Chinese). |
|
[4]
|
ZHANG G X,CHEN G N,ZHANG K.Effect of mismatch of yielding strength and residual stresses along substrate interface on interfacial crack propagation[J].Journal of Jilin University(Engineering and Technology Edition),2006,36(3):294-297(in Chinese). |
|
[5]
|
ZHANG G X,ZHANG K.The effect of laser hardened basal body on spread path of main cracks in chromium layer[J].New Technology & New Process,2006(9):10-12(in Chinese). |
|
[6]
|
XU X Y,ZHANG K,CHEN G N,et al.Influence of laser hardening substrate on microstructure and bonding of electroplating chromium coating[J].Chinese Journal of Lasers,2006,33(3):413-416(in Chinese). |
|
[7]
|
LI H X,CHEN G N,ZHANG G X,et al.Characteristics of the interface of a laser-quenched steel substrate and chromium electroplate[J].Surface & Coatings Technology,2006,201(3/4):902-907. |
|
[8]
|
ZHANG G X,LI H X,CHEN G N.The study of the micro-crack morphologies on the initial electroplated chromium layer by substrate-chemically etching method[J].China Surface Engineering,2006,19(4):8-12(in Chinese). |
|
[9]
|
PINA J,DIDS A,FRANCOIS M,et al.Residual stresses and crystallographic texture in hard-chromium electroplated coatings[J].Surface and Coatings Technology,1997,96(2/3):148-162. |
|
[10]
|
HUANG Z X,WU Ch S.The plating theroy[M].Beijing:Chinese Agricultural Machinery Press,1982:76,26-43( in Chinese). |
|
[11]
|
WU G,SONG G M,HUANG W J.Influence of laser processing parameters on the case-depth and the hardness[J].Laser Technology,2007,31(2):163- 165(in Chinese). |
-
-
Proportional views
-
Map
DownLoad: