Chromate Corrosion Inhibitors in Bimetallic Systems Compared by a Scoring Method Based on Visual Observations

Darrin, Marc

doi:10.1021/i560099a001

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…shows that after six months-there was no important change in the corrosion behavior of the described bimetallic systems up to at least five years; since the rate of corrosion decreased rapidly with lapse of time, it is probable that there would be little further change if the tests were continued. The principal variations from this general behavior occurred with the aluminum systems, which had a little higher corrosion score after five years than after six months, for reasons previously reported (9). With-most of the other bimetallic systems protective films were formed in the presence of chromate almost immediately.…”

Section: Technology Under Conditions Encountered In Practice' Marc Da...mentioning

confidence: 66%

“…Such comparative data are presented herewith for some of the more commonly encountered bimetallic systems. Details regarding preparation of test panels and manner of exposure were reported previously (9). These data are supplemented by pH records, analyses for chromate consumption, measurements of weight loss, etc.…”

Section: Technology Under Conditions Encountered In Practice' Marc Da...mentioning

confidence: 99%

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Chromate Corrosion. Inhibitors in Bimetallic Systems.

Darrin¹

1945

Ind. Eng. Chem.

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Section: Technology Under Conditions Encountered In Practice' Marc Da...mentioning

confidence: 66%

Section: Technology Under Conditions Encountered In Practice' Marc Da...mentioning

confidence: 99%

Chromate Corrosion. Inhibitors in Bimetallic Systems.

Darrin¹

1945

Ind. Eng. Chem.

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“…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%

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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“…This paper prepared for delivery before the Buffalo Meeting, October 11 to 13, 1950. the discontinuity. Such a mechanism, drawn directly from the chemistry of the system, is generally substantiated by Darrin in his papers on corrosion control with chromate (5).…”

Section: Introductionmentioning

confidence: 92%

Dichromate Reduction Rate at a Steel Surface in Air-Free, Acetic Acid Solution

Hackerman¹,

Hurd²

1951

J. Electrochem. Soc.

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A system was devised in which aqueous solutions of K2Cr2O7 and of acetic acid could be brought in contact with steel coupons in the absence of air. The rate of reduction of the dichromate was determined as a function of time by titration and spectrophotometrically. Changes in pH were also followed. Rates were measured with various initial concentrations of dichromate and of acetic acid and for several areas of steel surface. The effects of temperature, presence of normalNaCl , presence of oxygen, and order of addition of the solutions were studied. There was measurable loss of dichromate in all cases except those in which air was deliberately added. In general, the rate curves became level before all of the dichromate was reduced, with the maximum loss about 60 per cent. It was concluded that dichromate at 400 ppm was a fairly effective inhibitor to the corrosion of steel down to pH 3.0 in the absence of oxygen even with 1000 ppm normalNaCl present. A mechanism for the reaction and of the corrosion inhibition is proposed.

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Chromate Corrosion Inhibitors in Bimetallic Systems Compared by a Scoring Method Based on Visual Observations

Cited by 6 publications

References 2 publications

Chromate Corrosion. Inhibitors in Bimetallic Systems.

Chromate Corrosion. Inhibitors in Bimetallic Systems.

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

Dichromate Reduction Rate at a Steel Surface in Air-Free, Acetic Acid Solution

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