Influence of alloyed layer (FeSn2) and porosity of stannic sheathing on the corrosion of tinned sheet-iron

Abstract

Depending on the type of black sheet-iron pickling, with the acid sulphate (H2SO4) or sodium sulphate (Na2SO4), before electrolitic drifting of tin, at the production of tinned sheet-irons it was examined morphology of alloyed layer of FeSn2 using SEM microscope and diffraction of X-rays (X-RD). Supposed weight of tin is measured by EDAX analysis. Porosity of the surface was determined by ASTM specification and by potenciostic polarisation. Resistance on corrosion was measured through the ATC test, methods and AC impedance. Achieved results indicates on big importance of pickling type of white sheet-iron at his process of production.

U zavisnosti od tipa dekapiranja crnog lima, sa sumpornom kiselinom (H2SO4) ili natrijumsulfatom (Na2SO4), pre elektrolitičkog nanošenja kalaja, kod proizvodnje belih limova, ispitivana je morfologija zalegiranog sloja FeSn2 pomoću SEM mikroskopa i difrakcije rendgen zraka (X-RD). Prividna težina kalaja je merena EDAX analizom. Poroznost površine je određivana ASTM specifikacijom i potenciostatskom polarizacijom. Otpornost na koroziju je ocenjena preko ATC testa, potenciostatskih metoda i metode AC impedance. Dobijeni rezultati ukazuju na veliku važnost tipa dekapiranja belog lima u njegovom procesu proizvodnje.