Metallic coatings. Porosity tests. Porosity in gold or palladium coatings by sulfurous acid/sulfur dioxide vapour

2015 ◽  
Keyword(s):  
Sulfur Dioxide ◽  
Metallic Coatings ◽  
Sulfurous Acid

Sulfurous Acid Corrosion of Low Carbon Steel at Ordinary Temperatures - I. Its Nature

CORROSION ◽  
1966 ◽  
Vol 22 (5) ◽  
pp. 143-146 ◽  
Author(s):  
W. McLEOD ◽  
R. R. ROGERS
Keyword(s):  
Water Vapor ◽  
Carbon Steel ◽  
Sulfur Dioxide ◽  
Corrosion Rate ◽  
Acid Corrosion ◽  
Low Carbon Steel ◽  
Rate Data ◽  
Low Carbon ◽  
Sulfurous Acid ◽  
Ordinary Temperature

Abstract Corrosion rate data are presented for low carbon steel in (1) a combination of sulfur dioxide, water vapor and air, and (2) aqueous solutions of sulfurous acid in the absence of air, at ordinary temperature. Information as to the nature of the corrosion products is presented and it is shown that this depends on the place in which the corrosion takes place to an important extent.

scholarly journals A SCHIFF REAGENT OF CALIBRATED SENSITIVITY

1959 ◽  
Vol 7 (2) ◽  
pp. 93-97 ◽  
Author(s):  
HERBERT ELFTMAN
Keyword(s):  
Sulfur Dioxide ◽  
Positive Response ◽  
Spectrophotometric Analysis ◽  
Sulfurous Acid ◽  
Low Concentrations ◽  
Red Color ◽  
Violet Color ◽  
Schiff Reagent ◽  
The One ◽  
Excess Sulfur

The sensitivity of Schiff reagent for the detection of low concentrations of aldehyde increases progressively as the concentration of sulfurous acid in the reagent is lowered. Calibration of sensitivity is readily accomplished by titrating the Schiff reagent against the iodine of Lugol's solution. Stability of Schiff's solution depends on decreasing the evaporation of sulfur dioxide and of retarding the change of sulfite to sulfate. For practical purposes these ends can be achieved by storage in the refrigerator of a solution with greater sulfurous acid content and acidity than the solution used for staining. Evacuation of the excess sulfur dioxide or mixing in proper proportions with used reagent allows the rapid production of a solution of the desired sensitivity. If chemical preservatives are required, 0.5% hydroquinone gives very good results. Spectrophotometric measurement of the colored solutions produced by adding aldehyde to Schiff reagent indicates that at least two distinct compounds may result. The one that is usually mentioned as characteristic of a positive response of aldehyde to the Schiff reagent has a violet color. When the concentration of aldehyde is so low that only a Schiff solution of low sulfurous acid titer will react with it, a red color is produced. Spectrophotometric analysis shows this compound to be different from the original basic fuchsin and validates its use as an endpoint in the reaction of aldehyde with Schiff's reagent.

A Polarographie Study of the Corrosion Of Iron and Some Ferrous Alloys by Sulfur Dioxide

CORROSION ◽  
1958 ◽  
Vol 14 (12) ◽  
pp. 50-54
Author(s):  
F. J. BOWEN ◽  
A. H. GROPP
Keyword(s):  
Sulfur Dioxide ◽  
Corrosion Mechanism ◽  
Low Alloy Steels ◽  
Polarographic Method ◽  
Ferrous Alloys ◽  
Sulfurous Acid ◽  
Sulfur Dioxide Concentration ◽  
Alloy Steels ◽  
Corrosion Of Iron ◽  
Rate Of Consumption

Abstract A study was made of the manner in which sulfur dioxide attacks iron and ferrous alloys. A polarographic method was used to follow the changes in the sulfur dioxide concentration. Tests were made on one pure iron and seven low alloy steels exposed to sulfur dioxide over 12-hour periods. Extensive data are reported on the rate of consumption of sulfur dioxide by the various test samples. A corrosion mechanism involving the reduction of sulfurous acid by iron to give the sulfide is discussed. 4.3.2

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