Hydrogen Overvoltage (Cathodic Potential) on Titanium in Acidic and Basic Solutions

Straumanis, M. E.; Shih, S. T.; Schlechten, A. W.

doi:10.1021/j150526a010

Cited by 20 publications

(17 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The corrosion current in this ease is analogous to the exchange current of a noncorroding electrode. In the data reported by Straumanis (25,26) for the linear dependence of H overvoltage on applied current for Ti in HF, the region where Tafel behavior would be expected to appear had not been reached experimentally because of the high corrosion current under the conditions of test. For example, the corrosion rate of Ti in 1N HF has been reported as equivalent to 85 ma/cm 2 (28), while the overvoltage measurements were not carried farther than 50 ma/cm 2.…”

Section: Corroding Electrodementioning

confidence: 98%

Electrochemical Polarization

Stern¹,

Geary²

1957

J. Electrochem. Soc.

2,976

249

View full text Add to dashboard Cite

aqueous reaction to form the hydrated fluorides which are subsequently dehydrated at elevated temperatures in an atmosphere of HF gas. Extensive studies were made of the conditions for the preparation of high-purity ZrF4, and pilot plant equipment is described which was used to prepare 100 lb batches of the fluorides.The reduction step was investigated thoroughly, particularly for Zr, and those factors which affect metal quality and yield were determined. Reduction yields of 96 % were obtained with both Zr and Hf. After are-melting, the sponge Zr had a hardness of 40-45 Rockwell A and was readily cold-rolled into sheet. Zr metal thus prepared had a purity of about 99.8%.Hf metal, similarly prepared, had a hardness of 69 Rockwell A and was hot-rolled but was too brittle to be easily cold worked. The Hf was low in metallic impurities, but contained considerable amounts of C, N, and oxygen. ACXNOWLI~DGMENTS ABSTRACTAt low overvoltage values, deviations from Tafel behavior for a noncorroding electrode are due primarily to the reverse reaction of the oxidation-reduction system, and at high overvoltages to concentration and/or resistance polarization. It is shown further that the practice of placing straight lines through a few experimental points is extremely hazardous, while the indiscriminate introduction of "breaks" is contrary to the electrode kinetics described.Further complexities arising from a corroding electrode are described. In this instance, the forward and reverse reactions of both of the oxidation-reduction systems forming the corrosion couple must be considered. This representation of the local polarization diagram of a corroding metal is more fundamental than that used previously in the literature, and thus provides a clearer picture of the various factors which affect the corrosion rate and the shape of polarization curves.A region of linear dependence of potential on applied current is described for a corroding electrode by treating it in a manner analogous to that for a noncorroding electrode. An equation is derived relating the slope of this linear region to the corrosion rate and Tafel slopes. This relation provides an important new experimental approach to the study of the electrochemistry of corroding metals since, in some instances, interfering reactions prevent determination of T~fel slopes at higher current densities.Polarization measurements are an important research tool in investigations of a variety of electrochemical phenomena. Such measurements pernfit studies of the reaction mechanism and the kinetics of corrosion phenomena and metal deposition. In spite of their wide applicability and extensive use, considerable uncertainty in the interpretation of polarization measurements still exists. Some of the uncertainties include the proper method of plotting data and the correct interpretation of "breaks" in polarization curves. Abrupt changes in slope of overvoltage vs. log current have been given considerable significance in the past few years. Logan (1) examined various methods of plotti...

show abstract

Section: Corroding Electrodementioning

confidence: 98%

Electrochemical Polarization

Stern¹,

Geary²

1957

J. Electrochem. Soc.

2,976

249

View full text Add to dashboard Cite

show abstract

“…Straumanis et al 57 4 . These differences are probably related to different surface layers on the titanium.…”

Section: The Hydrogen Reduction Reactionmentioning

confidence: 99%

Stress-Corrosion Cracking of Titanium Alloys

Beck

Blackburn

1973

Advances in Corrosion Science and Technology

View full text Add to dashboard Cite

“…Most of the available data for the HER reaction on titanium is for sulfuric acid solutions. Straumanis et al 57 . These differences are probably related to different surface layers on the titanium.…”

Section: The Hydrogen Reduction Reactionmentioning

confidence: 99%

“…A few qualitative correlations can, however, be made. Straumanis et al 57 indicate that there was not a long delay from the time when the specimens were put into the solution until tests were begun. Therefore they probably did not have a surface hydride except in the strong acid solutions.…”

Section: The Hydrogen Reduction Reactionmentioning

confidence: 99%

Stress-Corrosion Cracking of Titanium Alloys

Statler

Spretnak²,

Beck³

et al. 2017

Stress-Corrosion Cracking

View full text Add to dashboard Cite

Cathodic Polarization Curve at a Scan Rate of 600 mV/hr 72 VI LIST OF FIGURES (Cont'd.) Figure Page 16 Cathodic Polarization Curve at a Scan Rate of 600 mV/hr with an Aerated Solution 7_ _T7 _ Cathodic Polarization Curve at a Scan Rate of 1500 mV/hr Snowing~~th~e" "Current-Increas e-Duri-ng a Back Scan Cathodic Polarization Curve Using a Platinum Counter Electrode 19 Current versus Time Behavior for Specimens held at -850 mV (SCE) 20 Scanning Electron Micrograph of the Surface Appearance of the Unpassivated Wire which Produced the Upper Curve of Figure 19; Strained at 10^/min. 2000X . 21 Scanning Electron Micrograph of the Surface Appearance of the Passivated Wire which Produced the Lower Curve of Figure 19; Strained at 10^/min. 2000X 22 Scanning Electron Micrograph of Fracture Surface of the Unpassivated Wire which produced the Upper Curve of Figure 19; Strained at 10^/min. 100X 87 23 Load versus Elongation Curve for a Specimen Fractured in Air at a Strain Rate of 10^/min. 90 2k Load versus Elongation Curve for a Specimen Fractured in Solution with an Applied Anodic Potential; Strained at 10f 0 /min. 91 25 Load versus Elongation Curve for a Specimen held at -1000 mV(SCE) for one-half hour then Strained at 10/ 0 /min. 26 Current Response to Straining at a Potential of +200 mV (SCE) at a Strain Rate of 10/ 0 /min. 92 7 Schematic Representation of the Change in Current During Straining. 28 Current Response to Straining at a Potential of -200 mV (SCE) at a Strain Rate of 10f 0 /min.

show abstract

Hydrogen Overvoltage (Cathodic Potential) on Titanium in Acidic and Basic Solutions

Cited by 20 publications

References 1 publication

Electrochemical Polarization

Electrochemical Polarization

Stress-Corrosion Cracking of Titanium Alloys

Stress-Corrosion Cracking of Titanium Alloys

Contact Info

Product

Resources

About