Pretreatment composition
A composition and substrate technology, applied in the direction of phosphorus compounds, electrophoretic plating, coatings, etc., can solve the problem of low corrosion resistance
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Embodiment 1
[0210] detergent bath
[0211] The detergent bath was Chemkleen 2010LP (a phosphate-free alkaline cleaner from PPG) and 0.125% Chemkleen 181ALP (a phosphate-free mixed surfactant additive from PPG) at a concentration of 1.25% v / v ) to prepare. For spray cleaning, a 10 gallon bath was prepared. The bath consisted of deionized water. The bath temperature was 120°F and when the panel was passed through the cleaner it was used for 2 minutes. The pressure for spray cleaning was 10-15 psi and a "veejet" series nozzle was used.
[0212] Zinc phosphate pretreatment bath 1 (comparison)
[0213] Fill the 5-gallon container about three-quarters full with deionized water. To this was added 700 ml of Chemfos 700A, 1.5 ml of Chemfos FE, 51 ml of Chemfos AFL and 375 ml of Chemfos 700B (all from PPG). To this was added 28.6 g of zinc nitrate hexahydrate and 2.5 g of sodium nitrite (both obtained from Fischer Scientific). The free acid of the bath is run at 0.7-0.8 point free acid, ...
Embodiment 2
[0267] Example #2A
[0268] Aluminum 6111 panels (from ACT Test Panels, LLC) were cut into 4"x6" sample dimensions. The bottom 3" of the panel was sanded with P320 grit silicon carbide paper (obtained from 3M) on a 6" random orbit palm sander (Advanced Tool Design Model-ATD-2088). The semi-frosted panel surface was used to determine any difference in corrosion performance between the as-milled (unfrosted) and frosted substrates. Surface sanding or grinding is practiced to promote adhesion of subsequent paint applications.
[0269] Each semi-frosted 6111 aluminum panel was washed with a standard Chemkleen 2010LP / 181ALP bath (comprising 1.25 vol% Chemkleen 2010LP (a phosphate-free alkaline cleaner available from PPG Industries, Inc.) in deionized water and 0.125 vol% Chemkleen 181 ALP (a phosphate-free blended surfactant additive from PPG Industries, Inc.)) was spray cleaned in a stainless steel spray tank using a V-shaped nozzle at 10-15 psi and 120°F for 2 minutes. This was...
Embodiment 3
[0304] bath preparation
[0305] Standard ChemKleen 2010LP / 181ALP cleaner : The detergent bath is Chemkleen 2010LP (a phosphate-free alkaline cleaner obtained from PPG) and 0.125% Chemkleen 181ALP (a phosphate-free mixed surfactant additive obtained from PPG) at a v / v concentration of 1.25%. prepared from PPG) in deionized water. For spray cleaning, a 10 gallon bath was prepared. The bath temperature was 120°F and the panel was used for 2 minutes as it passed through the cleaner. The pressure of this spray cleaning is 10psi-15psi.
[0306] Control Zircobond 1.5 (ZB-1.5, commercially available zirconium pretreatment composition) : To 5 gallons of deionized water was added 16.73 g of 45% hexafluorozirconic acid (obtained from Honeywell International Inc.), 30.02 g of a 2% by weight copper solution (prepared by dissolving copper nitrate hemipentahydrate in deionized water, from Fisher Scientific), 15.4 g of Chemfos AFL (from PPG) and 29.8 g of Chemfil buffer (from PPG). ...
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