Some aspects of copper corrosion in presence of benzotriazole and chloride ions

AbstractThe influence of 1H-benzotriazole, 5-methyl-1H-benzotriazole and 5-chloro-1H-benzotriazole on copper corrosion in an acidic sulphate medium was studied, as well as the influence of chloride ions on the corrosion behaviour of copper. The methods used were potentiodynamic measurements, open circuit potential and mass loss. The results show that the examined compounds possess good inhibitory properties in an acidic medium. The potentiodynamic polarisation results indicate that the degree of copper protection against corrosion depends on the concentration of Cl

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New insights into copper corrosion in presence of benzotriazole and chloride ions

Corrosion Engineering Science and Technology ◽

10.1080/1478422x.2018.1537157 ◽

2018 ◽

Vol 54 (1) ◽

pp. 75-85 ◽

Cited By ~ 2

Author(s):

Y. Zhang ◽

Y. Chen

Keyword(s):

Chloride Ions ◽

Copper Corrosion

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Interpretation of Bronze Disease and Related Copper Corrosion Mechanisms in Terms of Log-Activity Diagrams

MRS Proceedings ◽

10.1557/proc-267-1055 ◽

1992 ◽

Vol 267 ◽

Cited By ~ 2

Author(s):

Michael B. McNeil ◽

D. W. Mohr

Keyword(s):

Chloride Ions ◽

Copper Corrosion ◽

Activity Diagram ◽

Standard Temperature ◽

Copper Species ◽

Pourbaix Diagrams ◽

Activity Diagrams ◽

Temperature And Pressure ◽

Thermodynamic Variables ◽

Corrosion Mechanisms

ABSTRACTThermochemical data are used to construct a modified log-activity diagram for the system Cu-H-O-Cl-(C02) at standard temperature and pressure(STP). In these diagrams, coordinate axes represent activities of aqueous copper species and chloride ions other thermodynamic variables are collapsed onto the diagram. Modified log-activity diagrams are used as a supplement to study Pourbaix diagrams for the equilibria relevant to bronze disease and copper pitting and to show the relation between them.

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Junction of the Epithelium and Lamina Propria of the Bovine Rumen Mucosa

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100060350 ◽

1967 ◽

Vol 25 ◽

pp. 68-69

Author(s):

Al W. Stinson

Keyword(s):

Osmium Tetroxide ◽

Squamous Epithelium ◽

Short Chain Fatty Acids ◽

Chloride Ions ◽

Fermentation Products ◽

Ruminant Species ◽

Protective Shield ◽

Stratified Squamous Epithelium ◽

Lead Hydroxide ◽

Acetic Acids

The stratified squamous epithelium which lines the ruminal compartment of the bovine stomach performs at least three important functions. (1) The upper keratinized layer forms a protective shield against the rough, fibrous, constantly moving ingesta. (2) It is an organ of absorption since a number of substances are absorbed directly through the epithelium. These include short chain fatty acids, potassium, sodium and chloride ions, water, and many others. (3) The cells of the deeper layers metabolize butyric acid and to a lesser extent propionic and acetic acids which are the fermentation products of rumen digestion. Because of the functional characteristics, this epithelium is important in the digestive process of ruminant species which convert large quantities of rough, fibrous feed into energy.Tissue used in this study was obtained by biopsy through a rumen fistula from clinically healthy, yearling holstein steers. The animals had been fed a typical diet of hay and grain and the ruminal papillae were fully developed. The tissue was immediately immersed in 1% osmium tetroxide buffered to a pH of 7.4 and fixed for 2 hrs. The tissue blocks were embedded in Vestapol-W, sectioned with a Porter-Blum microtome with glass knives and stained with lead hydroxide. The sections were studied with an RCA EMU 3F electron microscope.

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TEM study of a biofilm on copper corrosion

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100163563 ◽

1996 ◽

Vol 54 ◽

pp. 220-221

Author(s):

W. A. Chiou ◽

N. Kohyama ◽

B. Little ◽

P. Wagner ◽

M. Meshii

Keyword(s):

Marine Bacterium ◽

Culture Medium ◽

Copper Alloys ◽

Pure Copper ◽

Localized Corrosion ◽

Natural Seawater ◽

Copper Corrosion ◽

New Approach ◽

The Past ◽

Copper Tolerant

The corrosion of copper and copper alloys in a marine environment is of great concern because of their widespread use in heat exchangers and steam condensers in which natural seawater is the coolant. It has become increasingly evident that microorganisms play an important role in the corrosion of a number of metals and alloys under a variety of environments. For the past 15 years the use of SEM has proven to be useful in studying biofilms and spatial relationships between bacteria and localized corrosion of metals. Little information, however, has been obtained using TEM capitalizing on its higher spacial resolution and the transmission observation of interfaces. The research presented herein is the first step of this new approach in studying the corrosion with biological influence in pure copper.Commercially produced copper (Cu, 99%) foils of approximately 120 μm thick exposed to a copper-tolerant marine bacterium, Oceanospirillum, and an abiotic culture medium were subsampled (1 cm × 1 cm) for this study along with unexposed control samples.

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Factors Influencing the Separation of Glu-Plasminogen Affinity Forms I and II by Affinity Chromatography

Thrombosis and Haemostasis ◽

10.1055/s-0038-1661211 ◽

1984 ◽

Vol 52 (03) ◽

pp. 347-349 ◽

Cited By ~ 6

Author(s):

Daan W Traas ◽

Bep Hoegee-de Nobel ◽

Willem Nieuwenhuizen

Keyword(s):

Affinity Chromatography ◽

Dissociation Constants ◽

Ionic Composition ◽

Chloride Ions ◽

Factors Influencing ◽

Two Factors ◽

Human Plasminogen

SummaryNative human plasminogen, the proenzyme of plasmin (E. C. 3.4.21.7) occurs in blood in two well defined forms, affinity forms I and II. In this paper, the feasibility of separating these forms of human native plasminogen by affinity chromatography, is shown to be dependent on two factors: 1) the ionic composition of the buffer containing the displacing agent: buffers of varying contents of sodium, Tris, phosphate and chloride ions were compared, and 2) the type of adsorbent. Two adsorbents were compared: Sepharose-lysine and Sepharose-bisoxirane-lysine. Only in the phosphate containing buffers, irrespective of the type of adsorbent, the affinity forms can be separated. The influence of the adsorbent can be accounted for by a large difference in dissociation constants of the complex between plasminogen and the immobilized lysine.

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