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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Other procedures that require the removal of solid corrosion products between exposure periods will not measure accurately the normal changes of corrosion with time. The reporting of nonuniform corrosion is discussed below. Special coupons for example, sections of welded tubing may be employed for speci?
Link to Active This link will always route to the current Active version of the standard. 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.
Location of deposits, variations in types of deposits, or variations in corrosion products are extremely important in evaluating localized corrosion, such as pitting and concentration cell attack.
In many such cases, corrosion rates are established by mass gain rather than mass loss. Alternatively, the coupon may be rotated through the environment, although it is then difficult to evaluate the velocity quantitatively because of the stirring effects incurred. 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?
A number in parentheses indicates the year of last reapproval. For solutions corrosive to glass, suitable metallic or plastic kettles may be employed. 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.
The procedures for determining these values are shown in detail in Test Methods E 8. The asmt given in parentheses are for information only. For example, lead exposed to sulfuric acid corrodes at an extremely high rate at?
This standard, rather than a standardized procedure, is presented as a guide so that some of the pitfalls of such testing may be avoided. Oxygen saturation is a function of the partial pressure of oxygen in the atsm.
If cleaning deposits for example, scouring powder remain or lack of complete dryness atsm suspected, then recleaning and drying is performed until a constant mass is attained.
This guide also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. Molarity and normality are also helpful in de? The others are used principally as a supplement to remove heavily encrusted corrosion products before scrubbing.
The corrosion rate can be calculated from the concentration of the matrix metal found in the solution and it can be compared to that determined from the mass loss of the specimens. Most tests related to process equipment should be run with the natural atmosphere inherent in the process, such as the vapors of the boiling liquid.
The use of towels for drying may introduce an error through contamination of the specimens with grease gg31 lint. Users of this standard are expressly advised that determination asgm the validity of any such patent rights, and the risk of infringement of such rights, are entirely their h31 responsibility.
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?
Interpretation of Results One purpose for this guide is to promote better correlation of results in the future and the reduction of conflicting reports through a more detailed recording of meaningful factors and conditions. There are a number of other special types of phenomena of which one must be aware in the design and interpretation of corrosion tests.
This practice also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the g311 shown below.
ASTM NACE / ASTMG31 – 12a Standard Guide for Laboratory Immersion Corrosion Testing of Metals
With borderline conditions, a prolonged test may be needed to permit breakdown of the passive? Link to Active This link will always route to the current Active version of the standard.
Cupric ions may also exhibit a passivating effect upon stainless steel coupons exposed at the same time. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine atsm applicability of regulatory limitations prior to use. Methods of Cleaning Specimens after Test 9.
It is imperative to note that this usually occurs with no signi? This statement must be quali? If clad alloys are exposed, special procedures will be required to ensure that only the cladding is exposed, unless the purpose is to test the ability of the cladding to protect cut edges in the test solution.
The total surface area of a circular specimen is given by the following equation: