| 摘要 |
<p>An amine fluoride neutralizing composition comprised of (a) about 1 to about 50 weight percent hydrofluoric acid, (b) optionally up to about 18 weight percent of a complex fluoride containing compound, and (c) about 45 to about 99 weight percent of an amine. The weight percentages are based on the total solids of the amine fluoride neutralizing composition. Also provided is a method of using the amine fluoride to produce a non-chrome pretreatment composition comprised of mixing from about 20 to about 30 weight percent of the amine fluoride neutralizing composition with about 70 to about 80 weight percent of at least one organic resinous material having an organic resinous material that is amine neutralizable; and adding water so as to achieve a total solids content of the non-chrome pretreatment composition of about 20 to about 60 weight percent. The pretreatment composition may be further diluted with water to form a non-chrome pretreatment bath having a total solids content of about 0.1 to about 10 weight percent, preferably from about 1 to about 5 weight percent. The amine fluoride neutralizing composition allows for a simplified manufacturing process of non-chrome pretreatment compositions by allowing the use of one, less corrosive, easy to handle compound rather than three separate materials which may be hazardous to handle, and it allows for the insertion of fluoride into a pretreatment composition without the introduction of extraneous cations which can destabilize or diminish the effectiveness of the pretreatment concentrate or bath.</p> |
