Test Results Cold-Rolled Steel

CORROSION TEST RESULTS (COLD-ROLLED STEEL) 

Effect of Oxides at the Interface on Corrosion Test Results 

The effect of interface of steel on the corrosion test result is summarized in Table 33.2. The results found for the panels, which were E-coated without phosphate or plasma polymer coatings, are quite astonishing. A scribe creep of 3.0 mm in a 4-week corrosion test was obtained for an oxide-removed CRS surface (without zinc phosphate nor plasma polymer), which is better than the E-coat on the 

Interfacial system 4-week test (mm) 8-week test (mm) 

Oxygen 2 seem, 20 W, 2 min, 50 mtorr (Ar- -H2) 2seem Ar-I-4seem H2, SOW, 16min, 50mtorr Cathodic polymerization  

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Fig. 17. Results from salt fog corrosion tests after 120 hours exposure according to ASTM B117 of cold-rolled steel samples coated with a polyureth tne coating containing no self-healing additives (control sample left and top center) and with the self-healing additives included (self-healing sample right and bottom center).

The results presented in this study focused on the evaluation of corrosion resistance of two high-Mn steels of the different initial structure in acidic and chloride media. The investigations were carried out on the specimens after the thermo-mechanical rolling and after cold deformation. The results of immersion and potentiodynamic tests as well as structural analysis prove that both examined steels, independent of initial structure, have very low corrosion resistance in acidic medium and low corrosion resistance in chloride solution. In particular it was found that ... 

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