ASTM E407 – 07 PDF

Originally approved in Last previous edition approved in as E–99 DOI: /E 2 For referenced ASTM standards. ASTM E()e1. Standard Practice for Microetching Metals and Alloys. standard by ASTM International, 06/01/ View all product details. Determination of Residual Stresses Numerically Obtained in ASTM AH36 Steel Welded by TIG Process. Pablo Batista Guimarães, Paulo.

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Immerse few seconds to a minute or more. Immerse or swab to 1 min. Make concentration changes on this basis. Mix equal volumes of Solutions A and B just before use.

Higher percentage of HCl minimizes pitting. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Can increase HNO3 to increase strength. A mixture of 5 drops of each will cover the surface of a 1 in.

National Academy Press, After etching, water rinse, — rinse, and dry.

Polishes at high currents. Staining and pitting increase as CrO3 increased.

Immerse in Solution A with gentle agitation for several seconds. Immerse 30 s—3 min. Better results are sometimes obtained by? In all cases, extreme care should be taken to remove all traces of the etchant by thorough washing and complete drying of the specimen before placing it on the microscope stage.

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The specimen is examined as polished under polarized atm. Immerse few seconds to a minute. Care must be taken to keep it moist because dry picric acid is shock sensitive and highly explosive especially when it is combined with metals such as copper, lead, zinc, and iron.

Use small portion of stock solution for 4 h max.

ASTM E Standard Practice for Microetching Metals and Alloys_百度文库

Follow with water rinse, alcohol rinse, and dry. Immerse or swab 10—60 s. Where ethanol e4407 methanol, or both are listed as alternates, ethanol is the preferred solvent. Immerse with gentle agitation 1—30 s. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Austenite turns brown on overetching. Some of these etchants will not work at all if water is not present.

Use stainless steel cathode and platinum or Nichrome wire contact to specimen. As cast Nickel Base: A light pre-etch, or a slight amount of polishing relief, may lead to sharper delination of the constituents after vapor deposition. Pre-etch steel specimens with nital before tinting astn MnS add 0. Electrolytic at 6 V for 3—6 s.

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ASTM E407-07 Standard Practice for Microetching Metals and Alloys

Swab 2 or more minutes e4077 desired surface. Composition given will saturate the solution with picric acid. If that does not provide enough detailed information, contact the chemical manufacturer directly. Stains sigma and chi yellow to red brown, ferrite gray to blue gray, carbides barely touched, austenite not touched. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Colors phosphides in cast iron.

Electrolytic at 6 V for few seconds. Therefore, a glove must be carefully selected and used to ensure that it will provide the aztm protection for the speci? At 30 V, etch for 1 min. Brown discoloration will form at edges of specimen. Will chemically polish with longer times.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Storage of fuming etchants in sealed or non-vented containers may create an explosion hazard.

Anodize 1—3 min, 20—45 V d-c. For etch-polishing, use shorter times.