ASTM G_Laboratory Immersion Corrosion Testing of Metals – Free download as PDF File .pdf), Text File .txt) or read online for free. ASTM G Other ASTM procedures for laboratory corrosion tests are tabulated in the Appendix. NOTE 1—Warning: In many cases the corrosion product on the reac-. ASTM G Standard Practice for Laboratory Immersion Corrosion Testing of Metals_能源/化工_工程科技_专业资料. 暂无评价|0人阅读|0次.
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Link to Active This link will always route to the current Active version of the standard. Masking may also be used to achieve the desired area ratios but may aastm crevice corrosion problems.
A method of electrolytic cleaning is described in Practice G 1. Using the above units for T, A, W, and D, the corrosion rate can be calculated in a variety of units with the following appropriate value of K: Measurement of percent elongation is a useful index of embrittlement.
This statement must be quali? If clad alloy specimens are to be used, ashm attention must be given to ensure that excessive metal is not removed. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Preferably, the use of a re?
One purpose for this guide is to promote better correlation of results in the future and the reduction of conflicting reports through g3 more detailed recording of meaningful factors and conditions. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Localized corrosion is reported separately.
This cracking occurs under conditions of applied or residual tensile stress, and it may or may not be visible to the unaided eye or upon casual inspection. Axtm most common testing periods are 48 to h 2 to 7 days. Warning- In many cases the corrosion product on the reactive metals titanium and zirconium is a hard and tightly bonded oxide that defies removal by chemical or ordinary mechanical means.
It should be used as a reference to ensure that the test will allow generation of data relevant to the application with the minimum of interferences. NOTE 1—If desired, these constants may also be used to convert corrosion rates from one set of units to another.
The procedures for determining these values are shown in detail in Test Methods E 8. A commercial surface may sometimes yield asrm most signi?
This guide also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. Oxygen saturation is a function of the partial pressure of oxygen in the gas. Your comments are invited either for revision of this v31 or for additional standards and should be addressed to ASTM International Headquarters. Astj proper interpretation of the results obtained, the speci?
If agitation is required, the apparatus can be modi? Proper ultrasonic procedures are an acceptable alternate.
The density in the constant K cancels out the density in the corrosion rate equation. The total surface area of a circular specimen is given by the following equation: This practice also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM G31 – 72() Standard Practice for Laboratory Immersion Corrosion Testing of Metals
If there are any pits, the average and maximum depths of pits are determined with a pit gage or a calibrated microscope which can be focused? The reporting of nonuniform corrosion is discussed below. The amount of possible contamination can be estimated from the loss in mass of the specimen, with proper application of the expected relationships among 1 the area of corroding surface, 2 the mass of the chemical product handled, and 3 the duration of contact of a unit of mass of the chemical product with the corroding surface.
For example, the accumulation of cupric ions in the testing of copper alloys in intermediate strengths of sulfuric acid will accelerate the corrosion of copper alloys, as compared to the rates that would be obtained if the corrosion products were continually removed. The phenomenon of forming a protective?
Where required, the exhausted constituents should be added or a fresh solution provided during the course of the test. This resurfacing may cause some surface work hardening, to an extent which will be determined by the vigor of the surfacing operation, but is not ordinarily signi?
Separate and special techniques are employed for the speci? It is necessary to evaluate this localized corrosion separately from the overall mass loss. Duplicate strips of low-carbon steel, each 19 by 76 mm 3?
Special coupons for example, sections of welded tubing may be employed for speci?