NIPPON STEEL CORPORATION

Corrosion potential

Quality

ZAM® and post hot-dip galvanized product (HDZ) show nearly the same level of corrosion potential.

Corrosion potential in different solutions (after immersion for an hour)

Corrosion potential in different solutions
Corrosion potential test solutions
Solution pH Temperature(°C) Remarks
5％NaCl 6.5 35 Solution specified in JIS Z2371 (salt spray test)
5%NaCl+HNO3+H2SO4※1 3.5 35 Solution specified in JIS H8502
(cyclic artificial acid rain test)
0.1％NaCl＋H2SO4※2 4 35 Solution specified in acid rain simulated combined-cycle corrosion test
Measurement was taken after the specimen was immersed in water solution for an hour and its corrosion potential was found fairly stable.
*1 : 5％NaCl（10L）＋HNO3（12mL）＋H2SO4（17.3mL), pH adjusted by NaOH
*2 : H2SO4 is added to 0.1% NaCl solution to adjust pH to 4.