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Intergranular attack

不锈钢晶间腐蚀E法 Test Item Intergranular attack
Purpose Analy corrosion resistance of the sample
Test Period 4-15 working days
Test Range All kinds of metal, metal alloy。
The Cost For details, please call hotline 0510-82605847

An accelerated metal corrosion test method, which is sensitive to intergranular corrosion of metallic materials under specific conditions, is to understand the chemical composition, heat treatment and processing technology. The principle is to use a variety of test solutions which can make the corrosion potential of the metal i n the constant potential anodic polarization curve. The difference of the metal grain and grain boundary in the potential range of the potential range of corrosion is accelerated. The intergranular corrosion test method for stainless steel, aluminum alloy, etc., has been standardized in many countries. Each standard has detailed provisions on the details of the experiment.

   Test method and standard

Test plan

Test standard

Test period

Remarks

10% oxalic acid etch test for stainless steel

ASTM A 262-2014
Method A
GB/T4334-2008 Method A
JIS G 0571:2003
ASTM A763-93(R2009)
Method W

4 working days

30mm*20mm*(3-5)mm
To take 2 or 4 samples by product

Sulfuric acid / ferric sulfate test for stainless steel

ASTM A 262-2014
Method B
GB/T4334-2008 Method B
JIS G 0572:2006
ISO 3651-2:1998 Method C
ASTM A763-93(R2009)
Method X

7 working days

65% nitric acid test for stainless steel

ASTM A 262-2014
Method C
GB/T4334-2008 Method C
JIS G 0573:1999
ISO 3651-1:1998

15 working days

Nitric acid/ hydrofluoric acid test for stainless steels

GB/T4334-2008 Method D

4 working days

16% sulfuric acid/ copper sulfate test for stainless steel

ASTM A 262-2014
Method E
GB/T4334-2008 Method E
JIS G 0575:1999
ISO 3651-2:1998 Method A
ASTM A763-93(R2009)
Method Z

4 working days

(80-100)mm*20mm*(3-5)mm
To take 2 or 4 samples by product

35% sulfuric acid/ copper sulfate test for stainless steel

ISO 3651-2-1998
Method B (20h)

 

The surface area of 15-35 square centimeters, the thickness of the plate is more than 6mm, the other best thickness should be less than 6mm, 1 groups of 2 samples

Method of 5 Per Cent Sulfuric Acid Test for Stainless Steels

GB/T 4334.6-2000

 

Sample total area 10-30cm2

Detecting Susceptibility to Intergranular Corrosion in Stainless Steel Pressure Vessels

GB/T21433-2008

 

Reference intergranular corrosion GB/T ABCDE method

   Test equipment and test picture

晶间腐蚀


不锈钢晶间腐蚀E法

  Sample requirements
Product category Specifications
(mm)
Sample size/mm Sample number
Length Width Thickness
Section steel / 30 20 3~4 2
Casting / 30 ≤20 / 2
80~100 ≤20 / 4
welding rod / 30 10 / 2
80~100 10 / 2
surfacing electrode / 30 / / 2
/ 80~100 / /

2

Welded joint Single weld 30 20 3~4 2
80~100 20 3~4 2
Cross weld 30 20 3~4 4
80~100 20~35 3~4 4
Steel plate, belt (Bian Gang) steel Thickness<4 30 20 / 2
80~100 20 / 2
Thickness>4 30 20 3~4 2
80~100 20 3~4 4
Steel bar (steel wire) Diameter≤10 30 / / 2
80~100 / / 2
Diameter>10 30 ≤20 ≤5 2
80~100 ≤20 ≤5 2
Seamless steel tube Outside diameter<5 30 / / 2
80~100 / / 2
15≥Outside diameter≥5 30 / / 2
80~100 / / 2
Outside diameter>15 30 ≤20 Tube wall<4mm 4
Tube wall≥4mm 4
80~100 ≤20 Tube wall<4mm 2
Tube wall≥4mm 4
Welded pipe Thickness≤4 30 /   2
80~100 /   2
Thickness>4 30 / 3~4 4
80~100 / 3~4 4
   Test report and evaluation
The test report mainly includes the following contents:
A) the name, size and area of the specimen;
B),such as allergic treatment should be recorded to the sensitization treatment system;
C) test time;
D) the weight of the specimen before and after the test;
E) corrosion samples per cycle rate of [g/ (M -.H)];
F) ratio of corrosion rate.
Test evaluation method:
A) surface metallurgical evaluation;
B) corrosion rate;
C) bending evaluation;
 
 
 
   Wuxi Laboratory

实验室环境

   Service process
Require
───Quick:Customer service reply consultation
 
Apply
───Standard:Fill in the application form, sign the agreement.
 
Testing
───Strictly:Strict compliance with the operating rules for the sample testing
 
Report
───Comply with the reporting procedures and ensure the accuracy of the data.
 
Archive
───Service:Archive customer's samples and contracts

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