Chromate Corrosion. Inhibitors in Bimetallic Systems.

Darrin, Marc

doi:10.1021/ie50428a020

Cited by 11 publications

(5 citation statements)

References 4 publications

(7 reference statements)

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“…The amount required would depend on the original concentration. This fact has been observed with sodium dichromate, where it was found that the consumption of chromate "decreases as the concentration of the chromate is increased" (8). The action of chromate is very similar to the action of nitrite and probably an oxidizing action is also involved.…”

Section: Discussionmentioning

confidence: 66%

Inhibition of Steel Corrosion by Sodium Nitrite in Water

Cohen¹

1948

J. Electrochem. Soc.

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in water, solution. The corrosion rate of silver has a positive temperature coefficient but it is necessary that enough time be allowed to establish a film of silver chloride, sufficiently thick, to make the diffusion of the chlorine to the silver surface, the controlling factor. ABSTRACT A study has been made of the effect of sodium nitrite on the corrosion of steel in water. The test methods included total and alternate immersion, a recirculation apparatus and potential measurements. The concentration of sodium nitrite required to inhibit steel corrosion depends on the conditions of motion and temperature. The inhibiting effect of sodium nitrite can be interpreted by solution potential measurements. The mechanism of inhibition is probably the formation of a protective oxide coating.

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Section: Discussionmentioning

confidence: 66%

Inhibition of Steel Corrosion by Sodium Nitrite in Water

Cohen¹

1948

J. Electrochem. Soc.

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“…38, No. 4 Apparently, with concentrations of sodium chromate between 100 and 500 p.p.m. the induced changes on the metal surfaces are uniform, but during the inceptive period there may be some unevenness in the deposition of the outer film.…”

Section: Methodsmentioning

confidence: 99%

“…Individual jars were employed for each panel, which was completely submerged and aerated with an excess of water-washed air. Other details were the same as previously described (4,5).…”

Section: Methodsmentioning

confidence: 99%

“…chromates and bichromates effectively inhibit the corrosion of iron in chloride-containing water. In closed water systems, such as are used for cooling locomotive Diesels (7), there is almost no mechanical loss of water, and it is not important to employ low concentrations of chromate; in fact, it is more convenient to use a comparatively high concentration (4). With open cooling towers and spray ponds which are employed for air conditioning and many industrial purposes, the situation may be very different.…”

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confidence: 99%

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Chromate Corrosion Inhibitors in Chloride Systems - Rate of Consumption of Chromate

Darrin¹

1946

Ind. Eng. Chem.

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simultaneous loss of chromate, it is most economical to employ the lowest concentration of chromate which effectively inhibits corrosion. It is better, however, to employ too much than not enough, since excess chromate not only increases the safe limit of salt concentration but in general reduces the amount of chromate consumed in the protection of metal surfaces. For this reason it is best to start the chromate treatment with a comparatively high concentration, 500 to 1000 p.p.m., and gradually reduce the amount of chromate over a period of months to the lowest concentration at which the particular installation is effectively protected against corrosion.

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“…They are particularly valuable for preventing corrosion when dissimilar metals are in contact. 2 A consideration of the literature shows the tremendous number and variety of chemical substances which are used as inhibitors and, indeed, it is probable that many more chemical compounds may function in this way under some special circumstances so that a complete list would be almost a chemical dictionary.…”

Section: Corrosion Inhibitors 1 Principles Of Inhibitionmentioning

confidence: 99%

Corrosion Inhibitors

Shreir

1954

Anti-Corrosion Methods and Materials

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The corrosion of metals can be reduced or prevented by influencing the electrode processes of electrochemical corrosion cells with suitable chemical additions to the corrosive electrolyte. It is the purpose of these articles to consider the mechanism of inhibition, and the applications and limitations of typical inhibitors. This first article is devoted to a consideration of the principles of inhibition in aqueous neutral solutions.

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Chromate Corrosion. Inhibitors in Bimetallic Systems.

Cited by 11 publications

References 4 publications

Inhibition of Steel Corrosion by Sodium Nitrite in Water

Inhibition of Steel Corrosion by Sodium Nitrite in Water

Chromate Corrosion Inhibitors in Chloride Systems - Rate of Consumption of Chromate

Corrosion Inhibitors

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