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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Stop when surface is dark. Precaution—Also poisonous by ingestion as well as skin contact. Electrolytic at 50—60 V for 10—20 s. Immerse to 1 min. Immerse polished face up for few seconds. Colors second phase constituents. See Guide E on 70 Laboratory Safety for additional information on safety precautions for electrolytes containing perchloric acid.

Immerse with gentle agitation 1—30 s.

Up to 30 mL of HCl may aetm used for more vigorous action. Then electrolytic in Solution B: It is not intended as a?

Immerse in Solution A for 2—5 s. Slowly evaporate the lumps and observe the surface of the specimen. A vacuum level of 1.

To slow reaction, add water to mL very carefully with stirring.

Use at 2—20 V dc, 5—20 s, stainless steel cathode. One or several small lumps of a suitable dielectric compound with the desired index of refraction is heated under a vacuum until it evaporates.

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KMnO4 is an agressive staining agent. After etching, water rinse, alcohol rinse, and dry.

[PDF] ASTM E Standard Practice for Microetching Metals and Alloys – Free Download PDF

Repeat as often as necessary. Observe printed cautions on reagent bottles. Immerse specimen aztm up. When more than one etchant number is given for a particular use, they are usually given in order of preference.

Immerse with gentle agitation 5—30 s. Do not store Properly discard after use.

Immerse in boiling solution for 5 min. 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. After 30 s maintain at 11?

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

Etch 2—3 s; 3 s pre-etch in No. Properly discard before solution attains a dark orange color. To mix, add the HCl to CrO3. Swab or immerse few seconds to a minute. Solution good for several days, or longer. Small additions of HNO3 activate solution and minimize pitting. Use fresh or age up to 1 min.

The etchant composition asgm procedure astmm then located in Table 2corresponding to the etchant number. May be used electrolytically. Electrolytic at 80 V for 5—30 min. Swab 3—10 s or immerse to 2 min.

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ASTM E407-07 Standard Practice for Microetching Metals and Alloys

Electrolytic at 20—60 V for 1—5 min. Etch time varies with material. Swab for 1—3 min. Pure Ta Ta alloys, 62 65, 61, 62, 66,general general general general general structure structure structure structure structure general structure general structure — boundaries and inclusions grain boundaries—retains carbide precipitate Thorium Base: Pure Co Hard-facing and tool metals High-temperature alloys 9, 10 11 12, 13c general structure via polarized light general structure general structure 14, 15, 16, 17 18, 19, 20 20, 18, 16, 21, 22b, 24, 25 19 general structure general structure general structure phase identi?

Multiple etching may be required. Additionally, one can contact the glove manufacturer or, if available, consult the manufacturers glove chart.

Continued Procedure Use a certi?

Decomposes with possible explosion on standing. Electrolytic at 6 V for ast, seconds. Electrolytic at 60— V for 5—30 s. Follow with water rinse, alcohol rinse, dry. Immerse few seconds to a minute.