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Galvanic corrosion of titanium-based dental implant materials.

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JAE

Galvanic Corrosion Prediction Using Long-Term & Short-Term Polarisation Curves

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Long term potentiostatic polarisation studies (120 days) in seawater were carried out on copper nickel alloys, bronzes, Monel, Inconel, titanium, zinc & stainless steels. Short-term studies using potentiodynamic scans (cyclic voltammetry) at 4 scan rates were carried out on these materials. Both methods were used to predict behaviour of two or 3 metal galvanic couples. Results were at least as good as those using galvanic corrosion rate tables & corrosion potential differences. Polarisation plots are shown. Table lists anode & cathode couple combinations, current densities, potentials, corrosion rates. 15 refs.

Galvanic Corrosion Properties of Differently PVD-Treated Magnesium Die Cast Alloy AZ91.

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SURF Different types of PVD coatings and plasma treatments were applied for the surface treatment of magnesium die cast alloy AZ91 specimens. The coating systems were: 9 µm chromium nitride hard coating. - 3 µm titanium nitride coating. - 0.5 µm plasma anodisation layer and 3 µm alumina coating. The wear and corrosion properties of the differently surface-treated AZ91 samples show crucial influence on the coating characteristics. While the known metalloid CrN coatings show wear properties due to high hardness and high coating thickness (9 µm), their corrosion properties are very poor due to crucial micro galvanic corrosion at coating defects. The plasma anodised and additionally Al2O3-coated specimens show good corrosion properties and are also prospective for tribological applications although their wear characteristics yet cannot reach the values for CrN-coated specimens. The work reports the results of a novel immersion to determine the time dependent corrosion behaviour of coated magnesium alloys [B.L. Tiwari et al, Magnesium Technology 2 (2002) 269]. Furthermore, the galvanic corrosion properties of differently coated AZ91 samples in contact with untreated AZ91, different aluminium alloys, roller bearing steel 100Cr6 and a titanium alloy TiAl6V4 were determined. The galvanic corrosion properties were tested according to DIN 50019.

Galvanic corrosion property of contacts between carbon fiber cloth materials and typical metal alloys in an aggressive environment.

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Galvanic Corrosion Protection Apparatus for a Pump.

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A sacrificial anode is incorporated in the pump housing.

Galvanic Corrosion: A Practical Guide for Engineers

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ISBN 1-57590-110-2.

Galvanic Couple Corrosion in Salt Spray Fog

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A matrix of 23 x 23 shows the corrosion performance of mainly non-noble metal couples in contact, in a salt-spray chamber. The results allow identification of best and worst pairs. 4 refs.

Galvanic coupling between pure copper and pure aluminium experimental approach and mathematical model.

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JES

Galvanic deposition of nanoporous silicon onto 6061 aluminium alloy from aqueous HF.

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JES

Galvanic Effects between Bright Nickel & Chromium Electrodeposits

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Open circuit potentials and galvanic couple potentials for Ni and Cr and their couples are reported, in terms of the corrosion potential they set up. Behaviour of microcracked Cr is shown. 14 refs.

Galvanic effects in the wet-chemical etching of metal films

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Wet chemical etching of thin metal films in manufacture of integrated circuits is discussed. Electrochemistry of process is considered and problems (undercutting) occurring when patterns are etched in metal films partly covered by more noble metal are discussed with reference to Mo in contact with Au. Methods for reducing undercutting are described.

Galvanic effects in the wet-chemical etching of metal films

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Wet chemical etching of thin metal films in manufacture of integrated circuits is discussed. Electrochemistry of process is considered and problems (undercutting) occurring when patterns are etched in metal films partly covered by more noble metal are discussed with reference to Mo in contact with Au. Methods for reducing undercutting are described.

Galvanic effects in wet chemical etching of metal films

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Where mixed metals are present, galvanic effects can alter etch rate and choice of etchant is crucial. Electrochemical basis is illustrated with polarisation plots, the role of hydrogen evolution as counter reaction is noted. The phenomenon of undercutting is explained. Molybdenum is used as example. Methods of reducing undercutting are noted. How to make bevelled edges is shown and how to obtain desired bevel angle. Graphs show etch rate of titanium in sulphuric + hydrofluoric, etch rate of Permalloy with titanium overlayer

Galvanic effects in wet-chemical etching of metal films

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Chemical etching of thin metal films in the manufacture of integrated circuits is discussed. Electrochemistry of process is considered and problems (under-cutting) occurring when patterns are etched in metal films partly covered by more noble metal are discussed with reference to Mo in contact with Au. Methods for reducing undercutting are described.

Galvanic filtering of gold or gold alloys.

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Method for the electrodeposition of gold or gold alloys from a plating bath or electrolyte onto secondary crowns and outer telescopes of telescopic prosthetic devices comprises depositing the gold or gold alloy from the electrolyte of high viscosity and inserting into the volume of the crown delimited by the inner surface of the crown. An independent claim is also included for an electrolyte for the galvanic deposition of gold or gold alloys containing an organic thickening agent for preparing the high viscosity of the electrolyte.