GB/T 15260-2016 English PDF (GBT15260-2016)

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GB/T 15260-2016: Corrosion of metals and alloys -- Test methods for intergranular corrosion of nickel alloys
GB/T 15260-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.060
H 25
Replacing GB/T 15260-1994
Corrosion of metals and alloys - Test methods
for intergranular corrosion of nickel alloys
ISSUED ON. AUGUST 29, 2016
IMPLEMENTED ON. JULY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 General ... 5
4 Method A. ferric sulfate (III) - sulfuric acid test ... 10
5 Method B. copper - copper sulfate - 16 % sulfuric acid test ... 13
6 Method C. hydrochloric acid test ... 15
7 Method D. nitric acid test ... 16
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 15260-1994 “Test methods for intergranular corrosion of
nickel alloys”; compared with GB/T 15260-1994, main technical changes are as follows.
- ADD the sampling requirements;
- MODIFY the general title of the clause in the original standard from “Sample
preparation” TO “Sampling and preparation”; SPECIFY the dimension of the
recommended sample according to different methods;
- MODIFY the schematic diagram of the test device in the original standard;
- MODIFY the “glass bracket” in the original standard TO “sample bracket”; RETAIN
the schematic diagram of bracket in the original standard; RECOMMEND two
kinds of glass bracket;
- DELETE the “boiling debris” in the original standard; ADD the relevant content to
the test solution of Method A;
- MODIFY the “heating device” in the original standard;
- DELETE subclause 8.4 of Method A in the original standard;
- ADD the test duration and density constant of the recommended alloy in Method
A;
- ADD the method for inspecting the effect of steam escape on the acid
concentration and the criteria for re-testing in Method A;
- MODIFY the normal annealed material in Method A in the original standard TO the
solid solution material;
- ADD the relevant clauses of the test report.
This Standard is proposed by China Iron and Steel Industry Association.
This Standard is under the jurisdiction of National Technical Committee on Steel of
Standardization Administration of China (SAC/TC 183).
Drafting organizations of this Standard. Pangang Group Jiangyou Changcheng
Special Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Zhejiang
JIULI Hi-Tech Metals Co., Ltd., Iron and Steel Research Institute.
Main drafters of this Standard. Wu Jie, Hu Jin, Hou Jie, Chu Yanli, Zhou Pingjiang,
Corrosion of metals and alloys - Test methods for
intergranular corrosion of nickel alloys
1 Scope
This Standard specifies the samples, test equipment, scope of application, test solution,
test procedures, evaluation of test results and test report of test methods for
intergranular corrosion of nickel alloys (iron nickel base, nickel base). This Standard
includes the following four test methods.
a) Method A. ferric sulfate (III) - sulfuric acid test;
b) Method B. copper - copper sulfate - 16 % sulfuric acid test;
c) Method C. hydrochloric acid test;
d) Method D. nitric acid test.
This Standard applies to nickel alloys used in corrosive environments. The choice of
the four methods, the sensitization treatment system of the alloy and the criteria for the
results are negotiated by the supply and demand parties of the alloy.
2 Normative references
The following documents are indispensable for the application of this document. For
dated references, the only dated edition applies to this document. For undated
references, the latest edition (including all modifications) applies to this document.
GB/T 622 Chemical reagent - Hydrochloric acid
GB/T 625 Chemical reagent - Sulfuric acid
GB/T 626 Chemical reagent - Nitric acid
GB/T 665 Chemical reagent - Copper sulfate pentahydrate
3 General
3.1 Sampling and preparation
3.1.1 For the recommended sample of Method A, C and D, the total area is 500 mm2
~ 2000 mm2, the ratio of the area of the sample to the area of the two faces shall not
be more than 20 %. The welding samples shall include welds, heat affected zones and
base metals, both of which are not more than 13 mm.
3.1.2 The dimension of the recommended bending sample of Method B. the length is
80 mm ~ 100 mm, the width is 20 mm, the thickness is 3 mm ~ 4 mm (samples with a
width or a thickness less than the recommended dimension shall be taken according
to the actual dimension). Pipes with an outside diameter of not more than 40 mm shall
be taken at 25 mm in length. In Method B, it shall take the original surface as the outer
surface of bending.
3.1.3 The sample shall be taken in the direction of the forging, and the surface shall
be as close as possible to the surface of the material in use. If necessary, the surface
of the sample is allowed to be machined, and the surface roughness is generally Ra ≤
0.80 μm.
3.1.4 When cutting the sample, it shall remove the deformed metal by grinding or
machining before the test. The sample shall be prevented from overheating during
machining.
3.1.5 The sample shall be degreased by non-chlorinated solvents, rinsed and dried
before the test.
3.2 Sensitization treatment of samples
3.2.1 For samples require sensitization treatment before the test, the surface needs to
be cleaned before the sensitization treatment, to remove carbon-containing lubricants,
grease, etc. To obtain a clean surface, mild surface grinding or pickling shall be carried
out, followed by washing with non-chlorinated solvents, rinsing and drying.
3.2.2 The sensitization system shall be negotiated by both supply and demand parties.
3.2.3 The sensitization treatment shall be carried out before the sample is finished.
3.2.4 For samples that do not require sensitization treatment, the test shall be carried
out in a state where the final conditions of use are simulated. For alloy materials that
need to be welded or heat-treated, they shall be treated as much as possible with the
same treatment as the material being manufactured or used.
3.2.5 Before the test, remove the scale of the sensitized sample by grinding.
3.3 Test equipment
3.3.1 Test devices
Figure 1 and Figure 2 are two recommended test devices. Figure 1 is a ground flask
with a capacity of 1 L and Soxhlet or Aster's condenser with at least four condensed
The precision of the analysis balance shall not be less than 0.001 g.
4 Method A. ferric sulfate (III) - sulfuric acid test
4.1 Scope of application
This method is suitable for the determination of the susceptibility of nickel alloys to
intergranular corrosion in ferric sulfate (III) - sulfuric acid test solution.
4.2 Test solution
4.2.1 Preparation of 600 mL of test solution. POUR 400 mL of distilled or deionized
water INTO the flask; ADD slowly 236 mL of sulfuric acid (excellent grade) as specified
in GB/T 625 TO the flask (to prevent bruising).
4.2.2 WEIGH 25 g of ferric sulfate (excellent grade) and add to the sulfuric acid solution.
4.2.3 To prevent bruising, it is recommended to use debris of pure aluminum oxide to
be added to the test solution.
4.2.4 INSTALL the condenser on the flask and pass through the cooling water; HEAT
the solution to boil until all the sulfuric acid is dissolved.
4.2.5 It shall protect the eyes and wear rubber gloves in the ope...