In November 2008 a new corrosion laboratory was set up in Acroni. With this new up-to-date equipment we are able to do corrosion tests based on international standards (EN ISO 3651-1, EN ISO 3651-2 (Methods A, B and C), ASTM A 262- Practices A, B, C, E and F), ASTM A 923 (Methods A, B, C), ASTM G 48 (Practice A), GOST 6032 (Method AMY).
Corrosion is a great challenge for the whole metal industry. Different types of these processes have the same meaning: they cause the collapse of the material in a certain environment.
The corrosion process starts at the surface of the material. The different intensities of the process depend on the chemical composition. Corrosion changes the local chemical composition, its mechanical and physical characteristics, the conformity of the surface and the life-time of various types of metal.
Forms of corrosion
- Uniform corrosion
- Galvanic corrosion
- Pitting corrosion
- Intergranular corrosion
- Selective corrosion
- Stress corrosion
- Hydrogen damage
- Erosion corrosion
We perform corrosion tests on different types of stainless steels:
To determine the resistance of materials we use different solvents at temperatures up to 160°C.
2. Intergranular corrosion
We use different methods to determine resistance to intergranular corrosion:
EN ISO 3651-1
Determination of resistance to intergranular corrosion of stainless steels - Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels - corrosion test in nitric acid medium by measurement of loss in mass (Huey test)
EN ISO 3651-2 Methods A, B, C
Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic - austenitic (duplex) stainless steels - corrosion test in media containing sulfuric acid
ASTM A262 Practice A, B, C, E, F
Standard Practices for detecting susceptibility to intergranular attach in austenitic stainless steels
- Practice A: Oxalic acid etch test for Classification of Austenitic Stainless steels,
- Practice B: Ferric sulfate-sulfuric acid test for detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels,
- Practice C (Huey Test): Nitric acid test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels,
- Practice E (Strauss Test): Copper -copper sulfate-16% sulfuric acid test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels,
- Practice F: Copper -copper sulfate-50% sulfuric acid test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels.
GOST 6032, Method AMY
Test methods for intergranular corrosion resistance; testing of test pieces in sulphuric acid and copper sulphate solution in presence of metal copper.
ASTM A923 Method A, B, C
Standard Test methods for detecting detrimental intermetallic phase in Duplex austenitic / ferritic stainless steels
3. Stress corrosion
NACE MR 0103
Materials resistant to sulfide stress cracking in corrosive petroleum refining environments
NACE MR 0175 Metals for sulfide stress cracking and stress corrosion cracking resistance in sour oilfield environments
EN ISO 15156 – 3
Materials for use in H2S - containing environments in oil and gas production - Part 3: Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys
4. Pitting corrosion
ASTM G 48 Practice A
Standard Test methods for Pitting Corrosion Resistance of stainless Steels and Related Alloys by Use of Ferric Chloride Solution
5. Heat resistance
Examinations are performed on stainless steels which are resistant to scaling. We examine these alloys at a higher temperature and in a different atmosphere. The degree of oxidation is determined by the change in mass.
Acroni is aware that the development of stainless steels of higher quality is based on their resistance to corrosion.
Our products are tested by methods prescribed by international standards.