TY - JOUR
T1 - Influence of steam-based pre-treatment using acidic chemistries on the adhesion performance of powder coated aluminium alloy AA6060
AU - Din, Rameez Ud
AU - Nikogeorgos, Nikolaos
AU - Jellesen, Morten Stendahl
AU - Shabadi, Rajashekhar
AU - Ambat, Rajan
PY - 2017
Y1 - 2017
N2 - In this study, the adhesion of a commercially applied powder coating on a steam treated AA6060 surface withpure steam and steam with citric and phosphoric acid chemistries has been investigated. Contact angle,roughness, and nanoscale pull off forces were determined as a function of the steam treatment prior toapplication of the powder coating. A focussed ion beam technique was used to examine the cross section of the powder coating, interface adhesion, and fracture morphology after the boiling test and interface indentation method. Transmission electron microscopy was used to study the fracture after indentation. Regardless of the steam treatment method, the wettability of the AA6060 surface was increased after the steam treatment. Addition of citric and phosphoric acid resulted in a low degree of hydrophobicity for the oxide layer compared to the use of pure steam. Steam generated oxide with citric and phosphoric acid resulted in poor penetration of th eadhesive over the intermetallic particles, and the interface showed mixed (cohesive/adhesive) fracture during interface indentation, while the pure steam treated surface showed dominant cohesive fracture.
AB - In this study, the adhesion of a commercially applied powder coating on a steam treated AA6060 surface withpure steam and steam with citric and phosphoric acid chemistries has been investigated. Contact angle,roughness, and nanoscale pull off forces were determined as a function of the steam treatment prior toapplication of the powder coating. A focussed ion beam technique was used to examine the cross section of the powder coating, interface adhesion, and fracture morphology after the boiling test and interface indentation method. Transmission electron microscopy was used to study the fracture after indentation. Regardless of the steam treatment method, the wettability of the AA6060 surface was increased after the steam treatment. Addition of citric and phosphoric acid resulted in a low degree of hydrophobicity for the oxide layer compared to the use of pure steam. Steam generated oxide with citric and phosphoric acid resulted in poor penetration of th eadhesive over the intermetallic particles, and the interface showed mixed (cohesive/adhesive) fracture during interface indentation, while the pure steam treated surface showed dominant cohesive fracture.
KW - Steam
KW - B. Aluminium and alloys
KW - Surface treatment
KW - C. Microscopy
KW - D. Interfaces
U2 - 10.1016/j.ijadhadh.2017.01.008
DO - 10.1016/j.ijadhadh.2017.01.008
M3 - Journal article
SN - 0037-0495
VL - 74
SP - 167
EP - 176
JO - Adhesion and Adhesives
JF - Adhesion and Adhesives
ER -