Abstract
In various aqueous salt solution systems with a metal specimen, it has been found that the current density ( i) measured by scanning vibrating electrode technique (SVET) increases in the order NaCl<Na 2SO 4<K 2CO 3<H 3PO 4<HCOOH. A linear correlation exists in various aqueous solution systems between i and the film resistance R f, or lifetime t s measured by electrochemical impedance spectroscopy (EIS). A growth of defects or disbonded area of the coating film from the steel substrate was observed with increasing immersion time in NaCl solution. A good correlation can be seen between the percentage (%) of disbonded area measured by the scanning acoustic microscope (SAM) and the R f, Young’s modulus ( E) and hardness ( H) measured by nanoindentation of the pigmented long oil alkyd resin paint (LAR-P) film on steel increased soon after immersion, then decreased with further immersion. The spread of lower E area and growth of blister with immersion time, which are difficult to observe by optical method, can be brought into vision by SAM. The % of corroded and uncorroded areas determined by O 1s spectra of X-ray photoelectron spectroscopy (XPS) correspond well to the R f.
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