TY  - JOUR
T1  - Adhesive Strength of Primers for Automotive Repair Painting under Various
Roughness Conditions
AU - Lee, Ju-Ho AU - Kim, Ho-Kyung AU - Hwang, Sung-Wan 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 21
SP  - 7795
EP  - 7799
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.7795.7799
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.7795.7799
KW  - automotive
KW  -roughness
KW  -repair painting
KW  -oil-soluble primers
KW  -Adhesive strength
KW  -variation
AB  - The aim of this study is to evaluate the adhesive strength of an oil-soluble primer under various
sanding conditions for automotive panel repair painting. The adhesive strengths of paint coatings with various
surfacers on steel surfaces were evaluated with variation of their surface roughness levels using various grades
of sand paper. After the sanding process to instill different degrees of roughness, the surface in each trial was
painted onto a steel plate coupon using a lacquer surfacer, a primer mixed surfacer, a surfacer with a wash primer
and a surfacer with an epoxy primer. For each sample, the adhesive strength of paint coating was evaluated with
a miniaturized tensile testing machine after the complete age-hardening of the painting over a corresponding
elapsed time of 150 days. It was found that a coupon with a rougher surface generally, exhibited higher
adhesive strength. The adhesive strength of paint coating under the as-received steel coupon (without a
sanding process) was much lower than that of the paint coatings which were sanded. The adhesive strengths
of the surfacer with a wash primer and the lacquer surface were 0.64 and 0.49 MPa, respectively. The adhesive
strength of the surfacer with a primer was found to be higher than that without a primer
ER  -