CA1286210C

CA1286210C - Aluminum cleaning process

Info

Publication number: CA1286210C
Application number: CA000529575A
Authority: CA
Inventors: Peter F. King; Thomas H. Fick; Karl A. Korinek
Original assignee: Henkel Corp
Current assignee: Henkel Corp
Priority date: 1986-02-18
Filing date: 1987-02-12
Publication date: 1991-07-16
Anticipated expiration: 2008-07-16
Also published as: ATE78066T1; GB2187206A; DE3780186D1; AU591231B2; DE3704376A1; EP0234425A2; AU6867887A; GB2187206B; GB8703714D0; EP0234425B1; JPS62247090A; EP0234425A3; JP2730891B2

Abstract

Abstract Of The Disclosure A process for cleaning aluminum container surfaces to remove aluminum fines and residual organic contaminants on the surfaces thereof which is particularly applicable for cleaning drawn and ironed aluminum containers of the type employed in the packaging of foodstuffs and beverages. The process includes a sequential cleaning, rinsing and optional treating cycle including an acidulated pre-wash solution for effecting the removal of a portion of the aluminum fines and organic contaminants followed by a primary alkaline cleaning step for removing the remaining aluminum fines and organic contaminants. The cleaned aluminum cans are thereafter water-base rinsed, preferably with an acidulated water-base rinse solution which can be counterflowed to the pre-wash stage whereafter the containers are preferably subjected to a treatment stage for applying a conversion coating thereon. The cleaned, treated aluminum containers can thereafter be further water rinsed and dried prior to the application of sanitary lacquers, printing inks, and decorative coatings.

Description

~ ~30,068 ~286210 ` ~ `-, R~C~GRG~ND OF TEE I~13NrION
.
The present invention broadly relates to an i~proved process _or clearing aluminum surfacQs, and m~ore particularly to a process e.~Dlo~L-.g ar. aou_ous alkalire cle3~er for cle~n~g aluminum contain_r s~r~aces wnich are subjectod `~ a pre-wash p~ior to cont~ct with the aquecus aIkaline cleanin~ solution. The present invention is -~ar~ic l~ly adaptable for cleaning drawn and ircned aluminum container ~}x~i~s of the tvpes e~plcyed in the pac:~aging of fcxxdstuffs ard e~n3ras~s. Ih_ cuD-shaped and dished integral bottom of such container lG bc2ies are cQn~cive to entrapment of the various cleaning and rinse sc~u~;ons during the prccessing ~hich has in so~e instan oe s, resulted in an o3~2c~i ~n~hle localized staining of the surfa oe s thereof during line stoDDages ~ring the cleaning cycle.
It has previously been discovered that by employing an aqueous alkaline cleaning solution of a controlled composition as described in United States patent ~7O. 4,599,116 issued July 8, 1986, entitled "Alkaline Cleaning 7Process", an elimination of such localized objec-tiona~le staining ~as achieved providing for clean aluminum containers of com~.ercially satisfactory quality.
It is conventicnal in such claaning cycles to o~nter loh7 a portion of the cl~aniny solution to an initial pre-wash stage to effect a ~reliminary cleaning of the aluminum containers prior to c~ntact wqth the s7~bsequent cperating aIkaline clearing solution. It has ncw been obs&-ved that the alkaline pre-wash solution resulting from a 2; o w nterrloh7 of a portion of the primary alkaline cleaning soluticn results in a progressive buildup of lubri0nt oils and organic ~x~z~
` --ontamlnants in the pre-wash solution resulting in the formation of gums, deposits and/or scale on th~ oonduits, screens, tanX walls and even as a redeposition on the aluminum container surfa oe s themselves resulting in increased difficulty in effective clezming tk~unb~f.
In accQrdance with the prDOeSS of the present invention, it has now been discovered that by utilizing a pre-wash ~olution, which is on the acid side, prior bo the subseq~nt alkal m e clea m ng step, the progressive bui1dup of oils and orgzmic oantaminants in the pre-wash stage is elimunated and mDre efficient and effective cleaning of the aluminum container surfa oe s is effec~ed in the cleaning cycle.
SU~*~gY OE ~HE INVENTIoN
The benefits and advantages of the present invention are based on the discxn~ry that by e~pl~ying an acidulated pre-wash st~ge prior to a s~bsequent aq~xous alkaline cleauiLng stage in a cleauling cycle for aluminum container surfaces, a progressive build~p of dissolved and/or enulsified oils and organic conta~ ants in the pre-w~sh stage is eliminated thY~by substantially reducing sludge formation on the operating ccn~x~ents of the pre-wash stage and substantially eliminat ~
a redeposition of such orga m ~ oontanr~3nts on the ~urfa oe s of the aluminum substrates b~ g clÆau~d. In acclI3!~nc~ with the present invention, it has ~een found that by oontrolling acidity of the pre-wash solution at a lev~l belcw akcut neutral, that is belcw a pH of about 7, the lubricants e~ployed in the body-making equiFnE~nt ~or F~x~ucing d~n~n and ironed aluminum oontainers ~ fnom the surfaces of such o~ntainers during the pre-wash stage ten~ to split frQm the aq~#~us pre-wash solution as a result of the bre~c~ng of the ern1lsion caus m g such organic oont2L~ilants to float on the surfa oe of the aqueous pre-wash solution enahllng remDval ~v shim~ing, decantation, and the ~2862~0 like. Acidification of the pre-wash soluticn can be achieved employmg any cQ~patible acid ca~?ound of which sulfuric acid itself o~nstitutes a preferred ingredient. Acidification can generally be effected to provide a pH of the pre-wash solution within a range of about 4 up to below about 7.
In accordanoe with the process of the present inventic~, the pre-was~2ed alunun~n container surfaces ar~ subse~uently subjected to an aL'caline aqueous cleaning trea~nt follc~ y ane or a plurality of aqueous rinse treatnents. It is g~rally preferred to fl~rt~ treat 'che surfa oe s of t21e alu ~ cx¢ltainers follchnung ~ e water-baæ rinse trea~ t to apply a c~rversion ocating thereon for oDrrosion resistance and to fuu~ber enhan oe mbbility and the rEx~q?tivity of the alunuuu2m c~ntaLJner surfa oe s t~ sanitary lacquers, inks and deoorative c~atings.
A~ditic~l benefits and advantaqes of the pres~nt invention will be~xlme aFpxLnent upon a reacling of the descripticn of the preferred e:ixl1Lments ta~3n in cDnjunctic;n with the sp~cific e~u~qples provided.

In acc~rdanoe w~th the ~rat*ice of t~e pr~ess of the pr~sent inven~ion and with particular refer~oe to the oleanir~ o~ d~ arLd ironed alumirn~m cl~ntair~rs, t}æ al~inum a~ai~rs trans~erred fran tlY3 bo~alcing and trinmir~ aE~?aratus are transferr~d to a ~ultiple stage cleaning cycle bD effect a re~oval of the lubricants an~ aluni~ ines or snut forned ~n the surfaoes of ~e al~um conta~ners during ~
i~ c~peration. ~lhe al~ um fines ~prise minute particles of al~num o~ the al~nin~n container surfac@s and adlE~ed thE~eto ~n ~,I,ination with the various lubricants u~d netal wc)rkis~g ~
employed during tbe for;nation of the aluminum container bo~. Such al~nin~n oDntainers having ~e co~taninatis2g fL~s and lubricants cn the " ' ' .
..:

362~ ~
surfa oe s t~neof are first ~subjected to a pre~wash t~ erfect a removal a portion of the fines and or~anic soils from the container Æ faces thereby reducing a buildup of such contaminants in the succeeding alkaline clearLing stage. The pre-wash solution ccmprises an aqueous solution containing an acid ccn~x~nent to provide a pH rarging from about 4 up to below abcut 7, with a p~ frcm about 4.5 to about 5.5 being pr_ferred.
Acidification of the pre-wash solution can be achieved by e~ploying any one of a ~ariety or mixture of acidic com~cnents of which ld suil~uric acid itself comprises a preferred material. In accordance with a preferred practi oe of the present inventian, at least a portion of the acidity of the pr~wash solution is supplied by oount~rflcwing an aci~l~ted water-base rin æ solution from the rinse stage following the prii~ary alkaline cLeaner stage either directly to thP pre-wash tank or 1~ to the alumir~m container bodies entering the pre--wash stage. In accordance with the teachings as set for the a ~ U. S. Patent No. 4,599,116 and as herein subsequently further dLsK3rJael, it was disccn~red that brcwn st2illing of the alu~inium ocntainer bcdies as a re~ult of line stc~ages in the water rinse stage cculd be substantially mitigated or eliminated by employ m g a mildly aci~ll~ted water-base rinse solution at a pH ~elsw about 7.5, and preferably from about 6.5 to about less than 7. In accor~an oe with a furt~r discavery by the Assignee of the pn~sent invention, t~e use of a highly acidulated water~aæ rinse solution of a pH cf bel~ S . 5 arx3 2 5 above about 1. 5 in the rinse stage foll~i~ ~x pn~ allsal~ne cleaning stage pr~v~ded fox furt~r cosm~tic e=~dr~ and n~ility of the alum~num conta~ers along the rails and trar~ort assen~lies of hig~s~eed conveyorized can lines. me counterflc-r~g of such ~ 8~;2~
a~idulated water-based rinses from the water rinse s-tage to the pre-wash slage may provide all or a portion of the acidity necessary in the pre-wash solution. Separate supplemental additions of acidity agents such as sulfuric acid can be added to the pre-wash solution, as may be necessary to attain the desired pH.
It has been found that employing such an acidified pre-wash solution, the organic soils and lubricants removed from -the container surfaces during the pre-wash cycle tend -to split out of solution as a result of the breaking of the emulsion and can be readily be removed in the form of a floating film on the surface of -the process tank such as by skimming or by outflowing over the tank wier, thereby reducing a progressive buildup of such organic contaminants during prolonged usage of the pre-wash solution.
The pre-wash solution may additionally contain one or a combination of surfactants of a type effective to enhance the removal of the organic contaminants from the surfaces of the aluminum containers.
For this purpose, surfactants which may be satisfactorily employed can be anionic, cationic or nonionic. Typical examples of such surfact-ants are: TERGITOL8 Anionic - 08 (Union Carbide Corporation) an anionic surfactant believed to be sodium 2-ethyl hexyl sulfate; TRITON* DF-16 (Rohm & Haas Co.) a nonionic surfactant believed to be a modified polyethoxylated straight chain alcohol; POLYTERGENT* S-505 LF (Olin Corp.) a nonionic surfac-tant believed to be a modified polyethoxylated straight chain alcohol; SURFONIC* LF-17 (Jefferson Chemical Co.) a nonionic surfactant believed to be an alkyl polyethoxylated ether;
PLURAFAC* RA-30 (BASF Wyandotte Corp.) a nonionic surfactant, believed to be a modified oxyethylated straight chain alcohol; PLURA~-AC D-25 (BASF Wyandotte Corp.) a nonionic surfactant believed to be a modified * Trade mark 8~
oxyethylated s-traight chain alcohol; TRITON X-102 (Rohm & Haas Co.) a nonionicsurfactant believed to be an octyl phenoxy poly ethoxy ethanol;
ANTAROX* BL 330 (GAF Corp.) a nonionic surfactant believed to be an alkyl poly (ethyl-eneoxy) ethanoli PLURONIC* L61 (BASF Wyandotte, Inc.) a nonionic surfactant, and believed to be a condensate containing only ethylene oxide and propylene oxide chains; TRITON CF-10 (Rohm & Haas Co.) a nonionic surfactant, and believed to be an alkylaryl polyether having a carbon chain of abou-t 14 carbon atoms and approximately 16 les of ethoxylation; SURFACTA~r* AR 150 (Hercules, Inc.) a nonionic surfactant, and believed to be an ethoxylated abietic acid derivative with approximately 15 moles of ethoxylation; ANTAROX LF-330 (GAF Corp.) a nonionic surfactant, believed to be an alkyl poly (ethyleneoxy) ethanol; RENEX 20 (I.C.I. United States, Inc.) a nonionic, polyoxyethylene ester of mixed fatty acids and resin acids; PEGOSPERSE* 700-TO (Glyco Chemicals, Inc.) a nonionic surfactant, and believed to be an abietic acid ester containing approximately 14 to 16 moles of ethoxylation;
IGEPAL* CA-630 (GAF CORP.) a nonionic surfactant, believed to be an alkyl phenoxy poly (ethyleneoxy) ethanol; and TRYCOL* LF-l (Emery Industries, ~nc.) a nonionic surfactant believed to be an alkyl poly ether.
When such surfactants are employed, they can be utilized in the pre-wash solution at concentrations generally ranging from about 0.005 up to about 5 grams per liter (g/l) with concentrations of from about 0.1 to abou-t lg/l being preferred.
The pre-wash solution is applied to the aluminum container surfaces at temperatures which can range from about ambient (i.e. about 60F) up to about 200F, and preferably at a temperature below about 150F, such as about 90 to about 130 F. The contact of the pre-wash * Trade mark ~. ' " ''"

~l286~
- solution with the aluminum surfaces to be cleaned can be effected b~
flooding, i~mersion or spraying of which the latter constitutes the preferred tech~ique particularly in the case of alu~inum containers because of their co~plex configuration thereby assuring uniform distribution of the pre-wash solutic~ on both the interior and exterior sur.aces thereof.
In accordan oe with a preferred practice of the present inven_ion, a portion of the pre-wash solution is c~ntinucusly withdrawn a~d after apDLu~uriate treat~ent is tra~sferred to waste. Make-up ~o water v~lune of the ,~pprcpriate acidit~ with or with w t supplemental surfactants is intl3xhlced to the pre-wash t~nk solution to maintain the desired solution acidity and volume.
Following the pre-wash stage, the prelinu~k~rily cleaned aluminum container bodies are transferred to a primary cle~lLLng stage incorporating an aq~x~ls aIkaline cle2¢L~ng solution of which a cleaning canposition such as described in United States Patent No. 4l599,116 cranstitutes a preerred formulation~ Typical of suitable ac~3~us alkaline cleaning co~positions are those containing an alk21inity agent present in an am3unt to achieve satisfactory rem~val of 'O r~si~a1 aluminum fines on the surfaces of the containers withcut incurring undesirable et~ling of the alumQI~rn surfaces. GesY~rally, ~ne p~ of the alkaline cl~a m ng solutio~ ranges frcm at least about 10 UD to about 13. m e alkal;nity agent comprises an alkali metal hydroxide and/or alkali ~etal carbonate in fuI~Yer combination with a suitable 2~ complexLn~ agent present in an a~unt effe~tive to ~ Iplex at least so~e of the ~etal ions present in the cleaning solution ~hich oth~rwise tend to rorm solution insoluble precipitates, i.e. sludge and hard scale.
Ctmplexlng agents which are p rticularly satisfactory for this purpose A

.~

include sugar acids and salts thereof sush as, for ~amplo, 00dium gluconate and sodium citrate; in further oombination with one or a mixture of selected surfactants effective to remDve the orga m c soils on ~he container surfa oe s. The aLkaline cleaning solution may cpkionally contain a foamrsuppressant agent of any of the types conventionally employed. The type and ooncentration of such foamrs4ppressant agonts will be dependent to some extent on the parti~ular type and oon oe ntration of surfactants employed in the cleaning solution. Such foam-suppressant agents are emplc~ed in ooncentratio~s sufficient to LO prevent undesirable fo ~ g of the cleaning solution particularly when applied by spray applic~tion.
In accordan oe wlth a preferred practi oe , the alkaline cleaning solution is contrDlled at a pH of from about 10 to abDut 13 with a p~ of about 11.5 to about 12.5 being preferred. In order to achieve an alkalinity within th~e fone3~1ng ran~es, the alkalinity agent such as sodium hydkoxide and/or sodium c ~ te are employed at conoentrations of from about 0.05 up to ~h~lt 10 g/l.
The ~nplexir~3 agent ~l~d in the a~Xalire c~aning solution can genexally range L~ll abcut 0.01 up bo abcut 3 g/l with concentrations of akcut 0.05 ko about 1 g/l being typical. In addition bo gluconic and citric acids and salts thereDf, gluoQbeptanoic acid, EDr~, tartaric acid and the like can be employ~d as well as the ba~h soluble and compa~ible salts and nixtures thereof~
The aIkal me cleaning sDlution further ocn~a~ns as an essential ingredient at least Qne or a oo~b m ation of surfactants which are usually selected from the grcup oomprising hydrccacbon alkoxylated surfactants which are character1zed as individually or in their blended combination as hav m g a Hydrophile-LiFuphile Balance (HIB ratio), i.e.

2~) -~he balan oe of the size and strength of the hydr~philic (water-lov m g or polar) and the lipcphilic ~oil-loving or non-polar~ groups of the lecule within an HIB ratio of at least about 12, preferably at least abcut 12 to about 15. While other surfactants can be employed to provide for effective cleaning of the aIkaline cleaning solution, it has been fou~d that e~Dlc~ing surfactants characterized by the foregoing HIB
ratios substantially reduces or eliminates a tendency of white staining on the surfa oe s of the aluminum container occasioned by line stcppages which frequently occur in hig~-capacity, high-speed container washers.
Such line stL~ppages may range f~cm about orr -half monute to as L3ng as a~out one hour and the presence of residual cleaning solution on the container surfa oe s has occasioned such white-staining pr3blems. By e~ploying surfactants of the appropriate HLB ratio, such white-staining has been substantially eliminated.
The a~ aus aIkal m e cleaning solution can also be applied, as in the case of the pre~wash soluti4n, by flooding, Immersi~n and preferably by spray application for a period of time sufficient to effect a cle2ning of the surfaoes thereof. Ges~rally, the ag~x~ls aLlcaline clear~ soluticfn is e~l~yed at ~-ate t~ratures bel~
~ a~ut 150~ to about a~3ient ter~Perah~e with tOE;~eratures of from abciut 90 to a~out 130F being preferred.
Follc~ng the aq~us aLlcaline cleaning stage, the resi~l aL1calin~e cleaning solutic~n is rE~ved fram the surfaoes of t~ container by rinsing with water~ase solutions, preferably in a ~ultiple sta~e water rinse section of the ~ve~rized was~er. In ac~-ordance with the process as described in United States Patent No. 4,599,116, it has further been discovered that by maintaining the pH of the water rinse solution at a level below about pH 7.5 and preferably at 0.~

~86~0 about pH of about 6.5 to about 7, a further elimination of any tendency to form brown stains on the container bodies is elimlnated. It has been demonstrat_d that if the pH of the aqueous rinse stage rises above ab~ut 7.5 as a result of calry-over of alkaline cle3 m ng solution into the 5subsequent water-base rinse stage, brcwn staining of the aluminum containQr surfa oe s ocrurs particularly when line stcppages occur in the rinsing stage.
Follcwing the water-base rinsing of the cleaned alum m um containers, it is usually preferred to subject the ocntainers to a 10conversion treat~ent such as by e ~ loying treating solutions based an heavy metal phosphates or zlrco m um with or without tannin. Exemplary of such conversion coatings suitable for use in the present pro~ess are those described in U.S. Patent Nos. 4,017,334; 4,054,466 and 4,338,140.

Ihe cleaned and treated oontainers can thereafter be dried and subjected to the application of one or a plurality of organic sanitary lacguer coatings, deoorati~e coatings, inks, and t~e like in accordance with conventional practi oe prior to the filling and sealing thereof with a~propriate focd stuffs or b~erages.
20In order to further illustrate the ilproved F~xxoess of the pres~nt inventi~n, the following specific examples are provided. It will be understccd that the examples are provided for illustrative purpos~es and are not intended to be limlting of the sccpe of the present invention as herein described and as set forth in the subjoinRd c1~ims.
2~EX~ LE 1 Drawn and ironed alumQnum container bodies hav~ng residual commercial body-formlng lubricants and residual aluminum fines on the surfa oe s ~hereof were subjected to a ~ult_ple stage cleaning cycle in a A

~28~ l0 . .~

pilot power spray can washer containing a total of l9 liters of solution in each of three stages. The cleaning sequence included a pre-wash of the containers for a period of about 9 to about 18 seconds at about 105 + 5Fr followed by an aqueous alkaline cleaning step for a period oP one minute at about 125F. Thereafter, the cleaned cans were water rinsed employing water at a temperature of about 48 to about 75F at a pH of about 7.
The aqueous alkaline cleaning solution was prepared by first preparing a dry concentrate containing on a weight percent basis, 60~
sodium hydroxide, 10% sodium gluconate, 20% soda ash, 5% of Tergitol 15-S-9 surfactant (HLB ratio = 13.5), 3~ microcrystalline wax based defoaming agent as a defoaming agent and 2% sodium citrate. The dry mixture was added to 19 liters of water at a concentration of 20 grams of the mixture to form the primary aqueous alkaline cleaning solution for use in the pilot spray can washer. During the cleaning operation, a portion of the primary alkaline cleaner in the second cleaning stage was counterflowed to the pre-wash stage producing a pre-wash solution having an alkaline pH of 10.5. Observance of the pre-wash solution revealed excessive emulsification of the body forming lubricants causing a progressive accumulation thereof and a redeposition thereof on the containers as well as on the walls, screens and nozzles of the pre-wash process equipment.

The cleaning cycle as described in Example 1 was repeated, but in this instance, hot water was employed in the pre-wash stage at a temperature of about 120 + 5F without any counterflow of primary alkaline cleaning solution from the cleaning stage to the pre-wash stage. The pre-wash solution was of a pH of about 8. Upon cleaning of ~ ~2~Çi2~.~
he al ~ um conta m er bodies in the cleaning cycle, lubricant redeposition on the waLls, screens and nDzzles of ~rhe pre-wa~h process equipnent, as well as on the alum m um contain~r body surfa oe s themselves, ~as again abserved as a result of inadequate clexulLng in ~he S pre-wash stage.
-A cleaning cycle was again emplcye~ as described m Example 1 ex oe pt that water was employed m the pre-wash stage to which sulfuric acid had been a ~ to provide a pH of about 6. FollcwnLng pre-wash, the oontainers ~ere again subjex~ed bD the prim3ry alkaline cleaning stage as prevnfYusly descr~bed follcx*~d by w~ter r~Lns ~ . riu~L~a operation of the cleaning cycle it was bbse3~fi~d ~hat the use of an acidi~ied pre-wash resulted in a breakiny of the em~lsion of oontami~ting lubricants rEmnA3d fr~m the aluminum oontainer bo*y surfa oe s which split cut and cxxiJd readily ke ren~n3d in the form of a floating fi~m in tbe proce9s tank such as by cnn~rflow or s~g.
W~ Lle it wlll be aF~xLnent that the p¢efersed ~txllLn~nts of the invention disclosed are well calculated tD fulfill the ~bjeots above stated, it will be aF~p~#ciated that the invention is 6us~sqptible tD
~o mDdifioaticn, v~ia~ion and cheu~ge without de}Y:r:ing _n~m the Fo~er soope or fair ~ of the subjo;rD~ olaims.

Claims

1. A process for cleaning aluminum container surfaces to remove aluminum fines and residual organic contaminants on the surfaces thereof comprising the steps of contacting the aluminum container surface with an aqueous pre-wash solution at a pH of less than about 7 for a period of time sufficient to remove a portion of the aluminum fines and organic contaminants on the surface thereof, thereafter contacting the pre-washed aluminum container surface with an aqueous alkaline cleaning solution for a period of time sufficient to remove substantially all of the remaining aluminum fines and organic contaminants and, thereafter, contact m g the cleaned aluminum container surface with at least one water-base rinse solution to remove any residual alkaline cleaner thereon.

2. The process as defined in Claim 1 m eluding the further step of controlling the pH of said pre-wash solution within a range of about 4 to below about 7.

3. The process as defined in Claim 1 including the further step of controlling the pH of said pre-wash solution within a range of about 4.5 to about 5.5.

4. The process as defined in Claim 1 including the further steps of acidulating said water-base rinse solution and counterflowing at least a portion of the acidulated said water-base rinse solution for admixture with said pre-wash solution.

5. The process as defined in Claim 1 in which said pre-wash solution further contains a surfactant.

6. The process as deformed in Claim 5 including the further step of controlling the concentration of said surfactant within a range of about 0.005 to about 5 g/l.

7. The process as defined in Claim 5 including the further step of controlling the concentration of said surfactant within a range of about 0.1 to about 1 g/l.

8. The process as defined in Claim 1 including the further step of controlling the temperature of said pre-wash solution within a range of about ambient up to about 200°F.

9. The process as defined in Claim 1 including the further step of controlling the temperature of said pre-wash solution within a range of about 90°F to about 130°F.

10. The process as defined in Claim 1 in which the step of contacting the aluminum container surface with said pre-wash solution is performed by spray application.

11. The process as defined in Claim 1 including the further step of contacting the cleaned and water-base rinsed aluminum container surface with a treating solution to apply a conversion coating thereon.

12. The process as defined in Claim 11 including the further step of contacting the conversion treated aluminum container surface with a water-based rinse solution to remove residual treating solution therefrom.