Electrodeposition and Surface Treatment最新文献

Influence of hexamine on the formation of zinc phosphate coatings on steel 六价铁对钢表面磷酸锌镀层形成的影响

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90060-7

W. McLeod, D.V. Subrahmanyam, G.R. Hoey

{"title":"Influence of hexamine on the formation of zinc phosphate coatings on steel","authors":"W. McLeod, D.V. Subrahmanyam, G.R. Hoey","doi":"10.1016/0300-9416(75)90060-7","DOIUrl":"10.1016/0300-9416(75)90060-7","url":null,"abstract":"<div>Addition of hexamine (0.1 – 2.0 g/l) to zinc phosphating solutions (H3PO4 30.0 g/l, ZnO 7.0 – 7.5 g/l) operated at 60 °C increased the thickness and weight of zinc phosphate conversion coatings on mild steel. Photomicrographs showed that the coatings were comprised of a rough fine- grained matrix which contained numerous grains of a needle-like to more rectangular phase having a smooth surface and higher reflectivity. Hexamine increased the number of these grains in the matrix. Electron microprobe analysis of the highly reflecting grains detected the presence of zinc, iron and phosphorous with the zinc to iron ratio increasing in the presence of hexamine while the phosphorous content remained constant. The increase in the zinc to iron ratio is due to an enrichment of α-hopeite phase relative to the phosphophyllite phase in these grains.The performance of hexamine was compared with that of sodium nitrate by the above methods as well as by potential measurements during phosphating and by the potentiostatic anodic polarization of phosphated steels in 0.6M NH4NO3 solutions. These studies showed that, as an accelerator for the zinc phosphating of mild steel, hexamine is as efficient as sodium nitrate.</div>","PeriodicalId":100399,"journal":{"name":"Electrodeposition and Surface Treatment","volume":"3 5","pages":"Pages 335-342"},"PeriodicalIF":0.0,"publicationDate":"1975-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0300-9416(75)90060-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73579072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Cobalt-chromium coatings by electrodeposition: Review and initial experimental studies 电沉积钴铬涂层:综述和初步实验研究

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90059-0

C.U. Chisholm

{"title":"Cobalt-chromium coatings by electrodeposition: Review and initial experimental studies","authors":"C.U. Chisholm","doi":"10.1016/0300-9416(75)90059-0","DOIUrl":"10.1016/0300-9416(75)90059-0","url":null,"abstract":"<div>The attraction of electrodepositing composite coatings is discussed in relation to sprayed coatings. The present state of the development of composite electrodeposited coatings is reviewed and the main limitations, such as the bulk hardness of the matrix, are discussed. The feasibility of developing a generation of wear resistant cobalt-chromium composite coatings and electroforms is examined in relation to the factors which would govern such a development. Cobalt-chromium co-deposition is reviewed and the results related to the requirements for composite co-deposition. Initial experimental results are reported on cobalt-chromium deposition from a fluoborate bath and the dimethylformamide-water bath. It is shown that the rate controlling factor is the inability to sustain co-deposition and thus achieve the requisite thickness for coatings and electroforms. It is suggested, on the basis of the results available, that predictable cobalt-chromium composites could be developed by the 1980's based on chromium solid solutions to achieve the hardness, and containing a high volume fraction of particles.</div>","PeriodicalId":100399,"journal":{"name":"Electrodeposition and Surface Treatment","volume":"3 5","pages":"Pages 321-333"},"PeriodicalIF":0.0,"publicationDate":"1975-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0300-9416(75)90059-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75044052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A study of the morphology of nickel electrodeposits and the influence of substrate and electrolyte, using high resolution replication 采用高分辨率复制技术研究镍镀层的形貌及衬底和电解液的影响

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90066-8

J.P.G. Farr, A.J.S. McNeil

引用次数: 5

Electrodeposition of copper on a copper single crystal (111) face in the presence of bromide ions 在溴化物离子存在下，在铜单晶(111)表面上电沉积铜

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90063-2

S. Nageswar

引用次数: 0

Electrodeposition of copper on a copper single crystal (111) face in the presence of chloride ions 在氯离子存在下在铜单晶(111)表面上电沉积铜

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90062-0

S. Nageswar

引用次数: 0

Crystal growth at the cathode 阴极处的晶体生长

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90067-X

S. Nageswar

引用次数: 10

Die kinetik der zinkkorrosion in 0,1m Boraxlösung 在10m硝酸溶液中锌

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90061-9

J. Friedmann, O. Fruhwirth, G.W. Herzog

{"title":"Die kinetik der zinkkorrosion in 0,1m Boraxlösung","authors":"J. Friedmann, O. Fruhwirth, G.W. Herzog","doi":"10.1016/0300-9416(75)90061-9","DOIUrl":"10.1016/0300-9416(75)90061-9","url":null,"abstract":"<div>Die Kinetik der Zinkkorrosion an rotierenden Scheibenelektroden in 0,1m Boraxlösung (pH = 9,2 konstant) wurde durch photometrische Zn2+ - Bestimmung untersucht. Die verwendete Apparatur erlaubte es, die Korrosion bei Variation der Elektrodengrösse, der Temperatur, der Drehzahl und des Sauerstoffpartialdrucks zu studieren, sowie Potential- Zeit- und Strom- Spannungskurven aufzunehmen. Es wird beobachtet, dass die Oxidation von Zink durch H2O zu Zinkoxid in den ersten Stunden schneller verläuft als die Auflösung von Zinkoxid und danach konstante Lösungsgeschwindigkeit eintritt: <math><mtext>d</mtext><mtext>c(</mtext><mtext>Zn</mtext><msup><mi></mi><mn>2+</mn></msup><mtext>)</mtext><mtext>d</mtext><mtext>t</mtext><mtext>=k′</mtext></math>k′ ist proportional der Elektrodenoberfläche, hängt exponentiell von der Temperatur ab (Aktivierungsenergie ca. 40 kJ mol-1) und ist drehzahlunabhängig. Während des Korrosionsvorganges beträgt das Elektrodenpotential -1360 mV (Hg/HgO/0,1m Boraxlösung). Es entspricht einer Elektrodenreaktion ZnO + H2O + 2e- ⇌ Zn + 2OH- die mit Hilfe von Strom-Spannungskurven identifiziert wird. Bei Anwesenheit von Sauerstoff im Elektrolyt (Luftsättigung) wird k′ um den Faktor 5 grösser. Zwei Erklärungen werden dafür diskutiert. Eine abschliessende Diskussion bezieht sich auf die Kinetik des Schichtdickenwachstums, nach der die konstante Lösungsgesch windigkeit als stationärer Vorgang (Durchtrittsgeschwindigkeit und Oxidationsgeschwindigkeit gleich gross) anzusehen ist.</div>","PeriodicalId":100399,"journal":{"name":"Electrodeposition and Surface Treatment","volume":"3 5","pages":"Pages 343-356"},"PeriodicalIF":0.0,"publicationDate":"1975-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0300-9416(75)90061-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84584824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Growth kinetics and screening action of mercury droplets electrodeposited from dilute solutions of electrolyte 稀电解液中电沉积汞滴的生长动力学及筛选作用

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90065-6

I. Markov, S. Toschev ∗

{"title":"Growth kinetics and screening action of mercury droplets electrodeposited from dilute solutions of electrolyte","authors":"I. Markov, S. Toschev ∗","doi":"10.1016/0300-9416(75)90065-6","DOIUrl":"10.1016/0300-9416(75)90065-6","url":null,"abstract":"<div>Electrolytically growing new phase particles exert a certain screening action which manifests itself in the formation of spatial undersaturated zones around them where the nucleation process is almost arrested. This phenomenon, resembling similar effects in vapour deposition, is due to the redistribution of the overpotential within the solution during the electrodeposition process. In concentrated electrolyte solutions the local deformation of the electric field around the growing centres in predominantly due to ohmic drop. In dilute solutions, concentration changes in the electrolyte occur which determine the radius of the nucleation exclusion zones. The phenomenon was investigated using the model of single mercury droplets electrodeposited on a smooth platinum single-crystal sphere. A triple-pulse technique was used to visualize the zones and to measure their radii. Detailed experimental measurements of the growth current of the mercury droplets are presented, showing that the electrolytic growth under the experimental conditions is governed by diffusion of the mercury ions in the solution. The experimental data are in quantitative agreement with equations derived for the growth current and the radii of both droplets and nucleation exclusion zones. Numerical data for the diffusion coefficient D of the mercury (II) ions are extracted. It is found that D = 8 × 10-3 exp(-4000/RT). The significance of the results obtained for the kinetics of the over-all electrodeposition process is discussed.</div>","PeriodicalId":100399,"journal":{"name":"Electrodeposition and Surface Treatment","volume":"3 5","pages":"Pages 385-397"},"PeriodicalIF":0.0,"publicationDate":"1975-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0300-9416(75)90065-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86463935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

The potential of Zn/ZnO electrodes in borax buffered solutions containing oxygen 锌/氧化锌电极在含氧硼砂缓冲溶液中的电势

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90064-4

N. Darwish, G.W. Herzog

引用次数: 2

A zinc-lead electrodeposit 锌铅电沉积

Electrodeposition and Surface Treatment Pub Date : 1975-09-01 DOI: 10.1016/0300-9416(75)90058-9

J.P.G. Farr, S.V. Kulkarni

引用次数: 1