Mechanical and Corrosion Resistance of Cold Sprayed Zinc (CSZ) Nano Composite Coating Enhanced by SiO2-GO Hybrid Material

2021 ◽

Author(s):

Chandrasekhara Sastry Chebiyyam ◽

Pradeep N ◽

Shaik AM ◽

Hafeezur Rahman A ◽

Sandeep Patil

Keyword(s):

Grain Size ◽

Corrosion Resistance ◽

Composite Coating ◽

Base Alloy ◽

Composite Coatings ◽

Nano Particles ◽

Alloy Sample ◽

Nano Composite ◽

Nano Coating ◽

Nano Composite Coating

Abstract Nano composite coatings on HSLA ASTM A860 alloy, adds to the barrier efficacy by increase in the microhardness, wear and corrosion resistance of the substrate material. Additionally, reduction of delamination of the nano composite coating sample is ascertained. Ball milling is availed to curtail the coating samples (Al2O3/ZrO2) to nano size, for forming a electrodeposited product on the substrate layer. The curtailment in grain size was ascertained to be 17.62% in Ni-Al2O3/ZrO2 nano composite coating. During the deposition process, due to the presence of Al2O3/ZrO2 nano particles an increase in cathode efficiency is ascertained. An XRD analysis of the nano composite coating indicates a curtailment in grain size along with increase in the nucleation sites causing a surge in the growth of nano coating layer. In correlation to uncoated HSLA ASTM A36 alloy sample, a surge in compressive residual stress by 47.14%, reduction of waviness by 32.14% (AFM analysis), upsurge in microhardness by 67.77% is ascertained in Ni-Al2O3/ZrO2 nano composite coating. Furthermore, in nano coated Ni-Al2O3/ZrO2 composite a reduction is observed pertaining to weight loss and friction coefficients by 27.44% and 13% in correlation to plain uncoated alloy respectively. A morphology analysis after nano coating indicates, Ni-Al2O3/ZrO2 particles occupy the areas of micro holes, reducing the wide gaps and crevice points inside the matrix of the substrate, enacting as a physical barrier to upsurge the corrosion resistance by 67.72% in correlation to HSLA ASTM A860 base alloy.

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Preparation and Study of Novel Nano-Composite Coatings on the Surface of Plastic Moulds

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.311-313.344 ◽

2011 ◽

Vol 311-313 ◽

pp. 344-347

Author(s):

Qian Wang

Keyword(s):

Corrosion Resistance ◽

Composite Coating ◽

Composite Coatings ◽

Metal Corrosion ◽

Coating Materials ◽

Nano Composite ◽

Optimal Amount ◽

Wear And Corrosion ◽

Nano Composite Coating ◽

Wear And Corrosion Resistance

Compared with ordinary coatings, nano-composite coating usually has a higher hardness and better wear and corrosion resistance. As coating materials, the nano-CeO2/Zn composites were prepared by nano-CeO2 and Zn powder. The microstructure was investigated by XRD and FESEM. The corrosion resistance and hardness of nano-CeO2/Zn composites with different amount of nano-CeO2 were comparatively studied. The results show that the metal corrosion resistance, hardness and density of the composites may be improved significantly by addition of nano-CeO2, and the optimal amount of nano-CeO2 is 1%.

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