Molybdate-based conversion treatment for improving the peeling strength between aluminum foil and polypropylene grafted with glycidyl methacrylate

Development and performance of hybrid coatings on aluminium alloy

“…The surface is comprised of variously shaped coating materials formed along with mud-cracking patterns derived from shrinkage stresses associated with drying out of gel-like materials. Such randomly shaped and cracked surface features have been suggested to be anchor sites for subsequently applied organic coatings with attendant improvement in paint adhesion characteristics of conversion coated substrates [20]. However other researchers believed that in addition to these anchor sites, bonds formation between organic coatings and species in conversion coatings play significant roles in the improvement of paint adhesion properties of conversion coated substrates [21].…”

“…However, several protocols in the last two decades have limited the use of carcinogens like volatile organic compounds (VOCs) and the chromates. In view of this shortcoming several authors [2][3][4][5] have researched into alternatives to chromates based on transition metal compounds without much success in terms of corrosion resistance superiority of the chromates. Although there are claims in the literature that some composite precursor compounds such as Permanganate/Molybdate [6] conversion coating has superior corrosion resistance to chromate and Molybdate conversion coatings separately, its application in the high technical end of the metal finishing industry may yet be in its infancy.…”

Effect of co-monomer on the adhesive performance of PP-g-MAH between cast polypropylene film and aluminum foil

“…Chromate conversion coating has been widely used in the surface treatment of Al foil for preparing Al/P film with high corrosion resistance, T-peeling and heat-sealing strengths [5,14,15]. However, hexavalent chromium is highly toxic and may cause severe environmental pollution, and thus many environmentally friendly alternatives have been developed, such as titanium (Ti) [7], molybdate [16,17], zirconium [18] and cerium conversion coatings [19,20]. Xia et al [7] prepared an environmentally friendly Ti conversion coating on the Al foil by a simple method, and the resulted Al/P film showed high peeling strength and corrosion resistance.…”

Preparation and adhesive properties of colored Ti/Zr‐based conversion coating on aluminum foil for lithium battery packaging

“…It is essential for LIB packaging materials to have good barrier properties to gas, light, water, and electrolyte during the service life of LIB . The six‐layered composite film often consists of the outer layer, outer adhesive, Al foil, conversion coating layer, inner adhesive, and inner layer (heat‐sealing layer) from the outermost to the innermost layer, where the outer layer is often made of nylon, and the inner layer is often made of CPP, as shown in Figure . The nylon layer provides mechanical durability, the aluminum layer separates gas, water, electrolyte, and other contaminants, the inner adhesive provides stability and T‐peeling strength, and the inner CPP layer provides heat sealability .…”

“…Xia and Xu found that surface treatment of Al foil with silane coupling agent resulted in an obvious increase in the adhesive strength between Al foil and CPP film using epoxy as the adhesive, as well as an increase in the heat‐sealing strength of CPP film. Liang et al developed an environment‐friendly molybdate‐based coating for Al foil, and the treated Al foil showed much better corrosion resistance than the untreated one. Moreover, the molybdate‐based conversion coating improved the T‐peeling strength between Al foil and glycidyl methacrydate grafting PP (PP‐ g ‐GMA) as the inner adhesive, and the effect was roughly equivalent to that of chromate‐phosphate conversion treatment .…”