Experimental investigation of electrodeposited Ni-Al2O3/ZrO2 nano composite on HSLA ASTM A860 alloy. (24th November 2021)

• Record Type: Journal Article
• Authors: C, Chandrasekhara Sastry; Pradeep, N; Shaik, A M; Rahman, H A; Patil, Sandeep
• Is Part Of: Surface topography. Volume 9:Number 4(2021)
• Publication Date: 2021-11-24
• Subjects: coating -- composite -- corrosion -- hardness -- nano -- residual -- resistance; Surfaces (Physics) -- Periodicals; Surfaces (Physics) -- Measurement -- Periodicals; 530.417
• DOI: 10.1088/2051-672X/ac396a
• Languages: English
• ISSNs: 2051-672X

Abstract

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 (Al2 O3 /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-Al2 O3 /ZrO2 nano composite coating. During the deposition process, due to the presence of Al2 O3 /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-Al2 O3 /ZrO2 nano composite coating. Furthermore, in nano coated Ni-Al2 O3 /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-Al2 O3 /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.