Corrosion testing procedures

Chapman, F. A., Corrosion Testing Procedures, Butler and Tanner, London (1964)... 

One procedure is to use test specimens in the form of discs which can be rotated at the desired speed while either wholly or partly immersed in the testing solution, and Freeman and Tracy described a device of this sort in a contribution to the ASTM Symposium on Corrosion Testing Procedures. With their apparatus the specimen discs were mounted on horizontal shafts and were partially immersed in the testing solution. 

Road vehicles-brake linings-seizure to ferrous mating surfaces due to corrosion-test procedure... 

Butt, L. T. and Wright, D. C. (1980) Use of Polymers in Chemical Plant Construction (Applied Science). Champion, F. A. (1967) Corrosion Testing Procedures 3rd edn (Chapman Hall). 

Each formulation will be tested for performance both in the laboratory and in the field before being offered for sale. Many standard scaling/corrosion test procedures are available. 

The ASTM Corrosion Test procedure by Total Immersion Method requires that all specimens in a test series should have the same dimensions when comparisons are to be made. In these experiments, carbon steel was used representing the pipeline material. The coupons were cleaned, polished and weighed. Coal-water slurry, 10 to 40 weight percent, was used in the corrosion tests. For the coal-water slurry the intitial pH of the medium varied from 2.3 to 2.6 and the test series containing the nutrient media, the microorganisms and the inhibitors the pH varied from 2 to 2.5. Specimens were immersed in the reaction vessel maintained at a constant temperature of 86°F for 72 hours or the specified time. The coupons were removed, washed with deionized water, dried and weighed. The loss in weight of the specimen, before and after the test was attributed to corrosion. 

Pilot plant tests, and laboratory corrosion tests under simulated plant conditions, will help in the selection of suitable materials if actual plant experience is not available. Care is needed in the interpretation of laboratory tests. Corrosion test procedures are described by Ailor (1971) and Champion (1967). 

When it became evident in 1947 that the berylliam supply was to be adequate, immediate tests were started to determine its corrosion resistance and mechanical properties. The first beryllium to become available was extruded material, and most of the initial corrosion testing was done on this. The corrosion-test procedures and preliminary results are fully described in OHNL-298.( This and later reports emphasize that the corrosion of beryllium in simulated cooling water can be controlled to a Iqrge extent by ... 

Wiederholt, W., Ed. (1945). Korrosionspriifverfahren (Corrosion test procedures). Verlag Chemie, Berlin, 210 pp. 

Filiform Corrosion Test Procedure for Painted Aluminum Wheels and Painted Aluminum Wheel Trim... 

Even though each step of the corrosion test procedure is important, if not properly evaluated the results can be misused or can lead to erroneous conclusions. It is important to remember that the corrosion rate is based on the extrapolation of results from short-term tests. For example, corrosion rates may be reported in the terms of millimeters per year (mmpy) on the basis of results obtained from exposure of one month, one week, or one day. The degree of extrapolation rcmges finm a multiple of 12 to 365. Since corrosion is rcirely Unear, with initial rates being extremely high, it is importcmt that the extent of extrapolation be considered in the evaluation phase of the test program. 

The precautions mentioned throughout this section focus on the planning and execution of the laboratory test and particularly in the interpretation of results. These cautions are not intended to provide a false impression that corrosion tests are unreliable. Rather, they are intended to emphasize that when corrosion test procedures are executed carefully and interpreted inteUigendy our knowledge of corrosion may be enhanced. That this is true is evident by the few number of cases of unexpected failures by corrosion or gross misapplication of corrosion resistant materials. 

In other systems, similar effects of dissolved gaseous species can be important and may require the use of HT/HP corrosion test procedures to give accurate simulation of service environments. Examples of such conditions are those that contain carbon dioxide, sulfur dioxide, and NOx, which can determine the pH of the aqueous phase and affect the severity of corrosion reactions. 

TfflS CHAPTER PROVIDES an overview of standard corrosion testing procedures for freshwater systems. Additional information is provided in Chapter 31—Freshwater. Freshwater can be defined simply as water that is not salty brackish water as defined by the dictionary is water having a somewhat salty taste. A more quantitative definition of brackish water is water with a salinity between 0.5 and 17 parts per thousand [/]. Then freshwater can be further defined as water with a salinity of less than 0.5 parts per thou-setnd. For the purposes of this chapter, ft shwater systems include potable water, heating/cooling, steam, condensate, rivers, streams, lakes, and wastewater. 

Corrosion testing procedures and standards established for wrought alloys are generally applicable to full dense P/M materials. They are discussed in other chapters in this section. Among the porous P/M materials, sintered stainless steels are by far the most important materials whose corrosion testing is of commercial interest [6]. Only a very limited number of reports are published on the corrosion behavior of any other types of porous P/M materials. Therefore, the following discussion will be focused principally on sintered stainless steels. Details relating to the P/M process are covered only to the extent that they are relevant to corrosion resistance. For additional information, the reader is referred to other publications [2,10,1... 

Road vehicles—Brake linings—Seizure to ferrous mating surface due to corrosion—Test procedure Soft soldering fluxes—Test methods—Part 12 Steel tube corrosion test Soft soldering fluxes—Test methods—Part 15 Copper corrosion test... 

SAEJ 1563 [348] Guidelines for Laboratory Cyclic Corrosion Test Procedures for painted Automotive Parts... 

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