Effect of pH, Surfactant, and Heat Treatment on Morphology, Structure, and Hardness of Electrodeposited Co-P Coatings

Zeinali-Rad, M.; Allahkaram, Saeed Reza; Mahdavi, S.

doi:10.1007/s11665-015-1599-6

Cited by 19 publications

(9 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Practical results have proved that the amount of included phosphorous can change the structure and characteristics of the deposits. [7,8] In this regard, the coatings with > 6 wt pct P have an amorphous structure, while the others with < 3 wt pct are crystalline. [24] Note that these values are not the same for all studies and can vary by a few percent in different reports.…”

Section: Introductionmentioning

confidence: 98%

“…[4,5] The other technical drawbacks of these coatings are hydrogen embrittlement and the presence of surface defects such as cracks. [6][7][8][9][10][11] Ni-based coatings, such as Ni-P, Ni-Mo, and Ni-W, as well as Co-based ones, including Co-P and Co-B, are among the systems suggested for use as a substitute for conventional hexavalent chromium coatings. [12][13][14][15][16][17][18][19] Originating from their suitable properties such as high resistance to both wear and corrosion, appropriate thermal stability, and noticeable hardness, pure Co deposits have attracted broad attention.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Safavi

Fathi

Charkhesht

et al. 2020

Metall Mater Trans A

View full text Add to dashboard Cite

During recent decades, CoP alloy deposits have gained enormous attention primarily owing to their favorable tribomechanical properties; therefore, they are regarded as a potential alternative to hard chromium coatings. The previous works on these systems usually addressed the approaches to improve their tribomechanical characteristics. However, to increase the industrial applications, especially in marine environments, enhancement of corrosion performance should also be considered. The focus of this investigation is improving the corrosion properties of CoP deposits through the incorporation of hybrid nanoparticles, i.e., MoS 2 and Y 2 O 3 , as well as controlling the applied current density. Microstructural and morphological aspects of the coatings were characterized by XRD, EDS, FE-SEM, and AFM. While the surface morphology of the CoP alloy deposit contains several surface defects, MoS 2 + Y 2 O 3 reinforced ones are compact and composed of nodular grains. Although there is no change in morphology of the nodular grains with current density variation, the surface roughness increases by increasing the current density from 15 to 25 A dm À2. Influences of both nanoparticle loadings in the electrolyte and the applied current density on the corrosion performance of the deposits are addressed in detail. Overall, the results confirmed that the CoP -4 g/L MoS 2 + Y 2 O 3 nanocomposite coating electrodeposited at 25 A dm À2 has the highest corrosion resistance against 3.5 pct NaCl solution, % 10 times higher than that of CoP .

show abstract

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Safavi

Fathi

Charkhesht

et al. 2020

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…Studies on the effect of pH and surfactant on properties of the electrodeposited Co-P coatings were carried out by Zeinali-Rad et al [9]. The results showed that P content of the coatings increased with the rising pH of the solution from 1 to 4, while the microhardness values decreased, and the highest hardness value was 600 HV.…”

Section: Introductionmentioning

confidence: 99%

“…Kosta [11,14] found that the grain size of the Co-P coatings deposited under single pulse current was obviously smaller than that deposited under direct current. They also concluded that the corrosion resistance of the Co-P alloy layer was better than that of the hard chrome layer from the potentiodynamic polarization curve, however, the corrosion resistance degraded severely after annealing at 400 • C. Some works [1,9,15,16] suggest that heat treatment could improve the microhardness of the Co-P alloy. After heat treatment for 10 min at 400 • C, the microhardness of the Co-P alloy could rise to 1000-1100 HV, while the hardness of hard chromium was usually 900-1000 HV.…”

Section: Introductionmentioning

confidence: 99%

Effect of Waveform and Heat Treatment Processes on the Performance of Electrodeposited Co-P Coating

Chen

Qian

2017

Coatings

View full text Add to dashboard Cite

Cobalt-phosphorus (Co-P) alloy is a promising material for the replacement of traditional hard chromium alloy of high hardness. In this paper, the cobalt-phosphorus alloy layer with high phosphorus content was formed by electrodeposition in a cobalt sulfate solution system under direct current (DC), single pulse (SP) current and double pulse (DP) current, separately. Surface morphology, structure and properties of the deposited layer were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), Vickers microhardness and a neutral salt spray test, respectively. The results showed that the dense Co-P coatings could be obtained by DC, SP and DP with P content of 9.6, 8.9 and 9.1 wt %, respectively. After 30 min heat treatment at 400 • C, coatings deposited under DC, SP and DP currents transformed from an amorphous to a nanocrystalline state, while the grain size was 12-13 nm, 10-12 nm and 8-10 nm, respectively. Among all these conditions, the microhardness of coatings deposited under DP current was the highest, which was 1211 HV, while the microhardness of coatings deposited under DC current was the lowest but higher than that of hard chromium. The wear rate of Co-P coatings was 4 × 10 −6 -5 × 10 −6 mm 3 /N m with Si 3 N 4 ball as bearing material, which was lower than that of hard chromium. In coatings deposited under different currents with a thickness of ca. 40 µm, no visible corrosion area appeared after 1000 h of a neutral salt spray test. Coatings heated at 300 and 400 • C reached the corrosion grade 7 and grade 4-5, respectively after 1000 h of a neutral salt spray test, so the wear resistance of Co-P coatings was better than that of hard chromium.

show abstract

“…Rabies is common in both domestic and sylvatic forms in most provinces and counties of Iran (3). Rabies is endemic in Iran and occurs frequently in domestic animals (4)(5)(6). The annual Increase of animal bites can enhance the costs due to importing anti-rabies vaccines and serums.…”

Section: Introductionmentioning

confidence: 99%

Epidemiology and Public Health Aspects of Animal Biting in Shush County, Khuzestan Province, Iran

Feizhaddad

Kassiri

Lotfi

et al. 2014

Arch Clin Infect Dis

View full text Add to dashboard Cite

Background: Animal bites, especially dog bites, are common health problems which are rarely addressed. It is estimated that 15 million people are bitten by animals worldwide annually. Diseases caused by animal bites are problematic matters in the world as well as in Iran. The main disease caused by animal bites is rabies. Rabies is a fatal acute viral disease causing inclusive symptoms in the central nervous system in domestic and wild carnivores. Humans and other warm-blooded mammals are often randomly involved with an infected animal bite. Objectives: Due to the increasing number of cases of animal bites in the County of Shush (southwestern Iran) because of its geographical status as a farming-animal husbandry region as well as the residents that are more exposed to animal bites, this study was designed to investigate the epidemiology and prevalence rate of animal bites in this county during 2000-2004. Materials and Methods: In this descriptive cross-sectional research, a particular questionnaire was filled out for all the cases. The questionnaire included questions about demographic and epidemiologic characters such as, occupation, sex, age, biting animal type, treatment type, bite site, etc. Data analysis through SPSS and Excel software was performed and the percentages and mean of statistical figures were determined. Finally, descriptive statistics was used in the forms of tables and graphs to summarize the data. Results: Findings of this study indicated that the average prevalence of animal bites during the above five years was 1.3 per 1000 population and there was an increased trend in the prevalence rate of animal bite in this county. During these five years, a total number of 1300 cases of animal bites were recorded: males 971 (74.7%) and females 329 (25.3%). The numbers of animal bites in rural and urban areas were 1061 (81.6%) and 239 (18.4%), respectively. Therefore, a 4.4-time rate of animal bites was recorded for rural areas. Moreover, the majority of animal bites (31.9%) were determined in the age group of 10-20. In terms of employment, students with 390 cases (30%) comprised the highest work-related group. From the viewpoint of bite site, the most prevalent biting site was feet with 907 cases (69.7%), followed by hands with 236 (18.2%) cases, while only one bite was recorded on the neck area. Totally, 95.8% of bites were confirmed to be applied by dogs; however, cats were responsible for only 3.3% of bites. During the five years of the study, 155 stray dogs in rural areas and 84 in urban areas were hunted. Conclusions: Due to the demographic status of Shush County, its high rural population engaged in agriculture and livestock farming, keeping dogs at home for job demands and a great percentage of animal bites among students, educational programs for students in schools and for farmers should be prioritized regarding first aid for prevention of animal biting.

show abstract

Effect of pH, Surfactant, and Heat Treatment on Morphology, Structure, and Hardness of Electrodeposited Co-P Coatings

Cited by 19 publications

References 42 publications

Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Electrodeposition of Co-P Coatings Reinforced by MoS2 + Y2O3 Hybrid Ceramic Nanoparticles for Corrosion-Resistant Applications: Influences of Operational Parameters

Effect of Waveform and Heat Treatment Processes on the Performance of Electrodeposited Co-P Coating

Epidemiology and Public Health Aspects of Animal Biting in Shush County, Khuzestan Province, Iran

Contact Info

Product

Resources

About