Structural changes and anti-corrosion properties of dry-in-place chromate coatings at drying temperatures up to 400 ^oC have been investigated using DTA, SIMS, XPS and SVET. DTA of the deposits from a chromate bath containing Cr³⁺, Cr⁶⁺ and PO₄^3- species showed two distinct peaks due to endothermic (85∼200 ^oC) and exothermic (200∼400 ^oC) reactions. SIMS analysis indicated the presence of high molecular fragments at the final endothermic stage (∼200 ^oC), suggesting that polymerization occurs; however the polymerized coating was partially decomposed at the subsequent exothermic stage (around 300 ^oC). XPS analysis disclosed that the deposits consist of Cr³⁺, Cr⁶⁺ (Cr₂O₇^2- etc) and PO₄^3- as polynuclear complexes at the endothermic stage. Furthermore, corrosion resistance of chromated electrogalvanized steel and self-healing effect were investigated. The order of corrosion resistance from the highest to the lowest as evaluated using a salt spray test for three drying temperatures was 200 ^oC, 85 ^oC and 300 ^oC; it was found that the corrosion resistance differed with the differences in the final drying temperature. The self-healing effect was remarkable in the chromate dried up to 200 ^oC, and high corrosion resistance was measured by SVET.