Showing papers in "Corrosion Science in 1978"

TL;DR: In this paper, surface films formed by adsorption of benzotriazole (BTA), on copper and copper alloys have been studied by X-ray photo-electron spectroscopy (XPS).

TL;DR: In this article, the composition and structure of passive films formed on a series of iron-chromium alloys in de-aerated 1M H 2 SO 4 were quantitatively studied.

TL;DR: In this article, the application of ultramicrotomy enables observation of the thickness and morphology of both very thin and friable surface films on aluminium, and it is useful in the study of certain phenomena concerning thicker porous-type anodic films.

TL;DR: In this paper, it was inferred that a well reproducible critical potential for crevice corrosion nucleation exists, which depends on the type of steel and is more negative than the critical potential of pit nucleation.

TL;DR: In this article, the electron beam thinning of porous anodic films formed on aluminium in the major anodizing acids enables observation of the apparent film material substructure to be made upon subsequent examination of the thinned regions in the electron microscope.

TL;DR: In this paper, the voltage polarization of mild steel in 1.OM hydrochloric acid containing a substituted thiocarbamoyl R CS NH 2 and related compounds has been studied at various inhibitor concentrations.

TL;DR: In this paper, the porosity of films anodically formed in a H 2 C 2 O 4 solution was determined using an anodic current of 0.5 mA/cm 2.

TL;DR: In this paper, it was found that the tannin reacted with the steel to form a crazed outer layer of ferric tannate and about half the rust was impregnated with the ferric-tannate or unreacted tANNin.

TL;DR: In this paper, the corrosion behavior of carbon steel in wet elemental sulphur under both aerobic and anaerobic conditions was studied as a function of the initial pH of the system and the particle size of sulphur.

TL;DR: X-ray photo-electron spectroscopy (XPS) studies have been made on the decorative films produced on stainless steel and on ‘Nilomag’ alloy 771.

TL;DR: Pitting corrosion of a cold-worked 18Cr 10Ni 2Mo stainless steel in an 0.1M NaC1 solution was studied using a potentiostatic technique, and statistical measurements of the pit dimensions and distribution were made using a metallographic image analyzer as discussed by the authors.

TL;DR: In this article, the build-up and stability of a passive state has been evaluated by varying the water content and the concentration of Cl− ions in methanol solutions, and it was shown that water content is the determining factor for passivity.

TL;DR: In this article, the relative passivity and pitting resistance of pure metals Ta, Nb, Ti, Zr, Cr and A1 in chloride solutions were studied through quasi-stationary potentiokinetic anodic polarization technique.

TL;DR: In this paper, the electrochemical behavior of nickel in alkaline aqueous solutions within the anodic potential range yielding Ni(OH)2 and under different potentiodynamic perturbations profiles has been investigated.

TL;DR: In this paper, the electrochemical methods for the measurement of the critical pitting potential have been analyzed in terms of their applicability to aluminium and its alloys and the difficulties associated with different methods are reviewed.

TL;DR: In this paper, the presence of metal ions (Cd 2+, Mn 2+, Zn 2+ ), more electronegative than the cathodic potential for the hydrogen evolution reaction on iron in a 0.25M H 2 SO 4 solution, inhibits the hydrogen reaction and corrosion of iron.

TL;DR: A Cameca ion analyzer has been used to examine aluminium surfaces, covered by 73 nm thick barrier type anodic films, after natural immersion for 1-15 min in a chromate/fluoride conversion coating solution at 293 K.

TL;DR: In this paper, the change in the alloy surface by heating in a vacuum up to 380°C has been studied for a series of iron-chromium alloys by means of X-ray photo-electron spectroscopy (XPS).

TL;DR: In this paper, the pitting behavior of aluminium electrodes in hydrochloric acid under an applied alternating voltage has been examined by scanning and transmission electron microscopy and electrical methods, and it was shown that the surface topography of an aluminium substrate can produce an overall pitted and convoluted surface topology with an overlying covering of relatively thin, probably discontinuous, hydrated alumina.

TL;DR: In this article, the pitting corrosion potential of the Sri electrode was measured in 0.005 to 0.1M NaOH, in the presence of various additions of Cl− ion.

TL;DR: In this article, the mechanism of grooving corrosion in electric resistance welded (ERW) carbon steel pipe in sea water was investigated, and it was shown that corrosion pits initiated immediately on the MnS inclusions and developed into groaving corrosion with the aid of the macrocell formed between the anodic narrow weld and cathodic base metal of the pipe.

TL;DR: In this paper, the reduction dissolution of magnetite was investigated in the acidic perchlorate solutions of various pH values by means of the potential sweep method and impedance measurement, with special interest in the mechanism of oxide dissolution.

TL;DR: In this paper, a simple analogy has been developed to simulate bulk and surface trapping of hydrogen by titanium substitutional solute atoms in α-iron at room temperature, based on the similarity between the ability of a capacitor to store electrons and of a trap to retain hydrogen.

TL;DR: In this article, high voltage electron metallographic studies of stress corrosion cracks nucleated on miniature U-bend specimens of austenitic stainless steels support an anodic dissolution mechanism of cracking.

TL;DR: In this article, the oxidation behavior of a range of nickel-base, high temperature alloys, including Brightray C, Brightray S, Nimonic 90 and Nimonic 105, including IN 713C, IN 587 and IN 597, was studied over the temperature range 850-1050°C.

TL;DR: In this paper, the parabolic growth of complex scales containing two or three components of pure metals has been analyzed and the ratio between the thicknesses of two layers is expressed as a function of the constants K i and limiting values are obtained.

TL;DR: In this article, the growth of oxide layers on martensitic FeCr (1.4122) and two austenitic Fe ǫCrNi steel samples ( 1.4550 and Incoloy 800) was studied by means of the 57Fe Conversion Electron Mossbauer Spectroscopy (CEMS) to characterize the topographical nature of the oxide layers.

TL;DR: In this paper, the corrosion of an aluminium alloy in an aqueous 5 % NaCl solution pH 5.5 and at pH 3.2 (by acidification with acetic acid) was studied.

TL;DR: The effect of both sodium chloride and sodium sulphate contaminant corrosion on the same range of nickel based alloys as tested in oxidation is reported over the temperature range 650-950°C as mentioned in this paper.