Fabrication of Functionally Graded Electroless Ni-P Coating with Variable Thickness and Evaluating the Coating Thickness Changes and Hardness by Response Surface Method (RSM)

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Touri Sajjad; Monir Vaghefi Sayed Mahmoud; ASHRAFI ALI

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Journal: IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING Year:2019 | Volume:- | Issue:41 Page(s): 1-13

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Title

Fabrication of Functionally Graded Electroless Ni-P Coating with Variable Thickness and Evaluating the Coating Thickness Changes and Hardness by Response Surface Method (RSM)

Author(s)

Touri Sajjad | Monir Vaghefi Sayed Mahmoud | ASHRAFI ALI | Issue Writer Certificate

Keywords

ElectrolessQ2

response surface methodQ1

gradient coatingQ1

Ni-P coatingQ1

Abstract

In this research, novel hybrid coatings were fabricated with a gradient thickness of Ni-P by the Electroless process on the steel substrate, so that the coating thickness along these coatings gradually changes. To fabricate coating with variable thickness, the method of taking out the sample from the Electroless bath during the process was used. For purposive experiments, response surface methodology (RSM) was utilized. Optical microscopy, SEM, EDS and micro-hardness test have been used to characterize the fabricated coatings. The results of variance analysis of the models indicated that the models are highly valued. The sum of squares showed that pH is the most important factor in coating hardness. Also, the effect of pH on the gradient of coating thickness is about 1. 5 times the sample exit rate of the Electroless bath and 2. 5 times the temperature. SEM images and EDS analysis results showed pH and temperature are two important factors in surface morphology and phosphorus content of coatings. The phosphorous content of coatings varies from 7. 8 to 10. 1 wt%. The coating fabricated in pH 5. 4 and 84℃ has the highest hardness about 650 HV. The coating fabricated in pH 5. 2, 86℃ and the sample exit rate from the Electroless bath 0. 11mm/min has the highest gradient of thickness, about 3μ m/mm.

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APA: Copy

Touri, Sajjad, Monir Vaghefi, Sayed Mahmoud, & ASHRAFI, ALI. (2019). Fabrication of Functionally Graded Electroless Ni-P Coating with Variable Thickness and Evaluating the Coating Thickness Changes and Hardness by Response Surface Method (RSM). IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING, -(41 ), 1-13. SID. https://sid.ir/paper/400310/en

Vancouver: Copy

Touri Sajjad, Monir Vaghefi Sayed Mahmoud, ASHRAFI ALI. Fabrication of Functionally Graded Electroless Ni-P Coating with Variable Thickness and Evaluating the Coating Thickness Changes and Hardness by Response Surface Method (RSM). IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING[Internet]. 2019;-(41 ):1-13. Available from: https://sid.ir/paper/400310/en

IEEE: Copy

Sajjad Touri, Sayed Mahmoud Monir Vaghefi, and ALI ASHRAFI, “Fabrication of Functionally Graded Electroless Ni-P Coating with Variable Thickness and Evaluating the Coating Thickness Changes and Hardness by Response Surface Method (RSM),” IRANIAN JOURNAL OF SURFACE SCIENCE AND ENGINEERING, vol. -, no. 41 , pp. 1–13, 2019, [Online]. Available: https://sid.ir/paper/400310/en

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