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GB/T 26491-2011 English PDF

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GB/T 26491-2011: Determination of intergranular corrosion of 5XXX series aluminum alloys by mass loss
Status: Obsolete
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GB/T 26491-2011English239 Add to Cart 2 days [Need to translate] Determination of intergranular corrosion of 5XXX series aluminum alloys by mass loss Obsolete GB/T 26491-2011

PDF similar to GB/T 26491-2011


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Basic data

Standard ID GB/T 26491-2011 (GB/T26491-2011)
Description (Translated English) Determination of intergranular corrosion of 5XXX series aluminum alloys by mass loss
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H25
Classification of International Standard 71.040.30
Word Count Estimation 6,681
Date of Issue 2011-05-12
Date of Implementation 2012-02-01
Adopted Standard ASTM G67-2004, NEQ
Regulation (derived from) Announcement of Newly Approved National Standards No. 6 of 2011
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the method for the determination with mass loss 5XXX series aluminum alloy sheet products susceptibility to intergranular corrosion test methods. This standard applies to 5XXX series aluminum alloy sheet products Determination of susceptibility to intergranular corrosion.

GB/T 26491-2011: Determination of intergranular corrosion of 5XXX series aluminum alloys by mass loss


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of intergranular corrosion of 5XXX series aluminum alloys by mass loss ICS 77.040.30 H25 National Standards of People's Republic of China 5XXX series aluminum alloy intergranular corrosion test methods Mass loss method Issued on. 2011-05-12 2012-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

Inter used in this standard reference redrafted law ASTMG67-04 "Determination of 5XXX series aluminum alloy susceptibility to intergranular corrosion test standard Method (NAMLT test) "establishment, and the degree of consistency ASTMG67-04 not equivalent. The main standards and ASTMG67-04 To technical differences are as follows. --- Test the temperature of the solution "30 ℃ ± 0.1 ℃" changed to "30 ℃ ± 1 ℃"; --- Test solution concentration from the "70% to 72%" to "32"; --- By the formula "X = (m1-m2)/s" changed to "X = (m1-mn-1)/s". The standard proposed by China Nonferrous Metals Industry Association. This standard by the national non-ferrous metals Standardization Technical Committee (SAC/TC243) centralized. This standard is drafted by. Southwest Aluminum (Group) Co., Ltd. Participated in the drafting of this standard. Northeast Light Alloy Co., Ltd., Chinalco Ruimin Co., Ltd. Nanshan Light Alloy Co., Ltd. The main drafters of this standard. Zhouren Liang, Wen Qinghong, Zhang Yu, Hou Yi, Lu Jinhua, Chen, Lee Shui-shan. 5XXX series aluminum alloy intergranular corrosion test methods Mass loss method

1 Scope

This standard specifies the room 5XXX series aluminum alloy sheet products crystal corrosion susceptibility test methods for measuring the mass loss method. This standard applies to inter-5XXX series aluminum sheet products - Determination of susceptibility to intergranular corrosion.

2 principle of the method

The 5XXX series aluminum alloy sheet product samples immersed in 30 ℃ of concentrated nitric acid 24h, measuring its mass loss per unit area, and The cross section for metallurgical analysis to assess susceptibility to intergranular corrosion.

3 test solution

3.1 Sodium hydroxide solution (ρ50g/L). 3.2 nitric acid solution (11). 3.3 nitric acid solution (32).

4 Test Equipment

4.1 electric heated water bath. 4.2 Analytical balance (being an amount of 0.1mg). 4.3 Glass dryer (putting color gel). 4.4 beaker.

5 Sample

5.1 with a number of test samples should be taken from the same batch or the same heat treatment furnace secondary products. 5.2 from each sample was cut out at least two parallel samples. 5.3 Sample size is 50mm × 6mm × thickness product (product thickness greater than 25mm, to 25mm thick sample processing and retention Rolling the original surface side, and mark the machined surface of the sample), wherein the rolling direction is 50mm processed products. 5.4 If the sample tested immediately, samples can be placed in the dryer in the short-term preservation.

6 Test procedure

6.1 with fine lines or fine sandpaper rasp sample. 6.2 The sample is immersed in the sodium hydroxide solution to about 80 ℃ (3.1) in 1min, then washed with water. 6.3 then the sample is immersed in a solution of nitric acid (3.2) in the 30s, and then washed with water. 6.4 The sample was dried in air. Not allowed to use cloth or paper towel to dry the sample.

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