15º Encontro e Exposição Brasileira de Tratamentos de Superfície
4º INTERFINISH Latino Americano
ESTUDO DE IMAGENS DIGITAIS PARA AVALIAÇÃO DA CORROSÃO
ATMOSFÉRICA
MARCO ANTONIO GOMES VALENTE JUNIOR, ARNALDO ALVES
CARDOSO, ASSIS VICENTE BENEDETTI, CECILIO SADAO FUGIVARA E
JULIANO PASSARETTI FILHO
UNESP – UNIVERSIDADE ESTADUAL PAULISTA - INSTITUTO DE QUÍMICA
BRASIL
Resumo
The relative weight loss and the time of exposure to the environment is used to
study atmospheric corrosion, but the weight change of the measurement may
not be the most suitable technique because the removal of the oxides produces
an error on this measure, where mass losses can be smaller than the initial
sample. An alternative is the use of image analysis that can be a powerful
method for the assessment of corrosion. Images can be obtained from
microscopes and digital cameras, but the use of the microscope may have
some errors if the corrosion is not uniform, because the image is focused on the
points of corrosion and, therefore, can not represent the entire surface. In this
work we compared the weight loss with the technique of obtaining corrosion
images using a digital camera, where the images were processed in two ways:
a) considering all the corroded area; b) considering a specific region of the
sample and the microscope images obtained.