Microstructure and corrosion behaviour of laser-clad TiC–Cr7C3–CNTs cermet coating on 304 stainless steel substrate

2016 ◽  
Vol 51 (2) ◽  
pp. 136-145 ◽  
Author(s):  
Q. Wu ◽  
N. Zhong ◽  
B. Liu ◽  
C. Fan ◽  
W. Li ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Stainless Steel Substrate ◽  
Corrosion Behaviour ◽  
Steel Substrate ◽  
304 Stainless Steel ◽  
Cermet Coating

Influence of MoSi2 Addition in Co Based Alloy Cladding Coating on Microstructure Evolution and Pitting Corrosion Behaviour

2013 ◽  
Vol 456 ◽  
pp. 392-398
Author(s):  
Ze Fen Liang ◽  
Min Zheng
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Stainless Steel Substrate ◽  
Corrosion Behaviour ◽  
Steel Substrate ◽  
304 Stainless Steel ◽  
Pitting Potential ◽  
Pitting Corrosion Resistance ◽  
Coating Microstructure

In the present paper the influence of the addition of MoSi2particles on the microstructure and pitting corrosion behaviour of laser cladding Co based alloy coatings deposited on 304 stainless steel substrate has been reported. The coating microstructure was investigated by SEM, OM, XRD and EPMA etc.. And the pitting corrosion resistance of coating was evaluated in the 3.5% NaCl solution. The results showed that: (1) The microstructure is fined by increasing MoSi2percentage. And the coating microstructure evolved from dendrites and interdendritic eutectics to various faceted dendrites with the bamboo leaf, flower, or butterfly morphology, when the MoSi2content is from 0~20% to 30~40%; (2) the (Epit-Eprot) of Co based alloy/MoSi2composite coating was lower than that of Co based alloy, and which presented higher self-repairing capability. The pitting potential Epitof Co +(0~20wt.%) MoSi2cladding coatings is higher than that of stainless steel, the pitting corrosion resistance is enhanced; When more MoSi2(30wt.%) was added, the pitting corrosion resistance decreases due to microstructure inhomogeneity and exiting of inclusion.

scholarly journals Effects of WC Particle Types on the Microstructures and Properties of WC-Reinforced Ni60 Composite Coatings Produced by Laser Cladding

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 583 ◽  
Author(s):  
Pengxian Zhang ◽  
Yibin Pang ◽  
Mingwei Yu
Keyword(s):  
Stainless Steel ◽  
Uniform Distribution ◽  
Laser Cladding ◽  
Steel Surface ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Composite Coatings ◽  
304 Stainless Steel ◽  
Stainless Steel Surface ◽  
Different Types

WC-reinforced Ni60 composite coatings with different types of WC particles were prepared on 304 stainless steel surface by laser cladding. The influences of spherical WC, shaped WC, and flocculent WC on the microstructures and properties of composite coatings were investigated. The results showed that three types of WC particles distribute differently in the cladding coatings, with spherical WC particles stacking at the bottom, shaped WC aggregating at middle and lower parts, with flocculent WC particles dispersing homogeneously. The hardnesses, wear resistances, corrosion resistances, and thermal shock resistances of the coatings are significantly improved compared with the stainless steel substrate, regardless of the type of WC that is added, and especially with regard to the microhardness of the cladding coating; the addition of spherical or shaped WC particles can be up to 2000 HV0.05 in some areas. Flocculent WC, shaped WC, and spherical WC demonstrate large to small improvements in that order. From the results mentioned above, the addition of flocculent WC can produce a cladding coating with a uniform distribution of WC that is of higher quality compared with those from spherical WC and shaped WC.

Effect of Time Depositions on Electrodeposited Cobalt-Iron Nanocoating

2012 ◽  
Vol 576 ◽  
pp. 565-568 ◽  
Author(s):  
Wan Normimi Roslini Abdullah ◽  
Koay Mei Hyie ◽  
Nor Azrina Resali ◽  
Chong Wen Tong
Keyword(s):  
Stainless Steel ◽  
Corrosion Rate ◽  
Surface Morphology ◽  
Elemental Composition ◽  
Stainless Steel Substrate ◽  
Corrosion Behaviour ◽  
Steel Substrate ◽  
Crystallographic Structure ◽  
Grain Sizes ◽  
Cobalt Iron

Cobalt-Iron (CoFe) nanocrystalline coatings are successfully prepared in 30, 60 and 90 minutes time depositions using electrodeposition method. The effect of time deposition towards crystallographic structure, elemental composition, surface morphology, microhardness and corrosion behaviour of CoFe coatings were investigated. The CoFe nanocrystalline coatings were deposited on stainless steel substrate at pH 3 environment. The grain sizes of the coatings are in the range of 57.88 to 70.18 nm. The CoFe nanocrystalline coating prepared at 90 minutes deposition achieves the highest microhardness of 290 HV. This coating also exhibits the lowest corrosion rate with 1.086 mpy. It is found that the increment of time deposition improves the microhardness and corrosion behavior of CoFe nanocrystalline coatings.

Effect of Electrolytic/Chemical Pretreatment on Adhesion Strength of DLC Coatings on 304 Stainless Steel Substrate

2013 ◽  
Vol 771 ◽  
pp. 35-40 ◽  
Author(s):  
Yi Dong Jin ◽  
Chao Yin Nie ◽  
Chun Hua Ran ◽  
Wen Zhu ◽  
Yang Zhao ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Adhesion Strength ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
304 Stainless Steel ◽  
Etching Time ◽  
Chemical Pretreatment ◽  
Dlc Coatings ◽  
The One ◽  
Better Than

To improve adhesion strength of DLC coatings on 304 stainless steel substrate,we studied substrate pretreatment by electrolytic/chemical etching methods.In this study,The DLC coatings were deposited on two groups of 304 stainless steel which had been electrolytically and chemically etched separately. The morphology of the coatings and substrate were characterized by SEM and metalloscope. The surface roughness of substrate was measured by roughness tester .The result shows that adhesion strength of DLC coatings on 304 stainless steel substrate is improved obviously due to mechanical interlock,surface adsorption and stress release.With prolonging the etching time,the adhesion strength of DLC coatings on the chemically etched substrate increase firstly and then decrease. The adhesion strength of DLC coatings on electrolytically etched substrate continuously increase. DLC coatings on electrolytically etched substrate perform better than the one on chemically etched substrate in adhesion.This is caused by the different surface morphology.

Stress corrosion and mechanical properties of zinc coating on 304 stainless steel

2021 ◽  
Vol 63 (3) ◽  
pp. 209-218
Author(s):  
Hua Zhang ◽  
Sihan Zheng ◽  
Yue Wang ◽  
QiLiang Li ◽  
Jie Tao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Stainless Steel ◽  
Stress Corrosion ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Zinc Coating ◽  
304 Stainless Steel ◽  
Three Point Bending ◽  
Indentation Tests

Abstract The effect of stress corrosion on the mechanical properties of the coating in the zinc coating/304 stainless steel substrate system was investigated by three-point bending, slow strain rate tensile (SSRT) and nano-indentation tests. Studies have shown that fracture toughness was improved when the coating was thick but weakened when the coating was thin. At varied coating thicknesses (80 μm, 160 μm, 240 μm, 320 μm, 400 μm), the decline rates of the fracture toughness were 77.48 %, 71.82 %, 66.67 %, 55.48 % and 51.52 %, respectively, and those for the critical strain of crack initiation were 94.97 %, 91.88 %, 88.42 %, 76.19 % and 74.33 %, respectively. In addition, simulations were made to analyze the crack propagation of zinc coating in coating/substrate system under tensile loading by ABAQUS, which proved the accuracy of the experiment.

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