Metal corrosion resistance level 10 standard
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Metal corrosion resistance – Grade 10 standard. Corrosion resistance category: Corrosion rate (mm/a). Grades: 1 – Completely resistant: <0.001; 2 – Highly resistant: 0.01–0.005, 0.005–0.01; 3 – Resistant: 0.01–0.05, 0.05–0.14; 4 – Moderately resistant: 0.1–0.5, 0.5–1.0; 5 – Slightly resistant: 1.0–5.0, 5.0–10.0; 6 – Not resistant: >10.0
This is a grading standard for the corrosion resistance of metals, which is divided into 6 grades based on the corrosion rate (in mm/a). Grade 1 indicates complete corrosion resistance, with a corrosion rate of less than 0.0011 mm/a ； Grade 2 indicates high corrosion resistance, with a corrosion rate between 0.005–0.0123 mm/a ； Grade 3 indicates corrosion resistance, with a corrosion rate between 0.05–0.145 mm/a ； Grade 4 indicates moderate corrosion resistance, with a corrosion rate between 0.5–1.067 mm/a ； Grade 5 indicates poor corrosion resistance; the corrosion rate is between 5.0 and 10.089 mm/year ； Grade 6 indicates poor corrosion resistance, with a corrosion rate greater than 10.010 mm/a. .
May I ask which standard or specification this comes from? Thank you!
The \"Metal Corrosion Prevention Handbook\" edited by the Chinese Society for Corrosion and Protection classifies the corrosion resistance of metal materials into 10 grades, which is the classification mentioned above. It is said that this method was used quite early on, but it is less utilized these days. In his book \"Corrosion Data and Material Selection Handbook\", Mr. Zuo Jingyi classifies the corrosion resistance levels of metal materials into 4 grades, drawing on European and American standards. The ISO 9223 standard specifies the methods for grading and classifying atmospheric corrosion, dividing atmospheric corrosion into 6 levels: C1, C2, C3, C4, C5, and CX. There is also the classification of SYT 0087. These are the various ways of classification that can be seen at present.