8/13/2019 Testing for the acid resistance of lacquers

1/7

Sitti Janeen N. Mamogkat Date Performed: September 7, 2011

2009-373! Date S"bmitted: September 1#, 2011

$%. 10 &e'ting (or &)e *+id e'i'tan+e f a+/"er'

. ntrod"+tion

&)e in'ide of +an' t)at are "'ed a' +ontainer' of food in food ind"'trie' are +oated it) a+/"er'.

a+/"er or a+/"er paint t4pi+a4 denote' a paint t)at drie' to a more t)an "'"a4 )ard and

'moot) '"rfa+e. 5en.ikipedia.org, 20116 a+/"ering of +an materia' ater' t)eir +orro'ion

performan+e. 4 +o8ering t)e meta, t)e a+/"er i'oate' it from t)e prod"+t, red"+ing intera+tion.

&reated a' inert barrier', a+/"er' +an ater t)e ratio of e%po'ed area' of +an meta'. &)i' +an +)ange

+orro'ion pattern'. oe8er, a+/"er' are not tota4 inert rea+tion' +an )appen t)ro"g) t)em.

*n e%ampe of a +ommon +orro'i8e +)emi+a i' +on+entrated a+eti+ a+id. ;)en a meta )a'

intera+ted it) it, t)ere o"d be r"'t formation or +orro'ion. *not)er +)emi+a t)at o"d generate

+orro'ion i' ater. ;)en t)ere i' pre'en+e of air, r"'t o"d form in +an t)at )a' dire+t +onta+t to

ater. n t)e ot)er )and, t)ere i' a'o a +)emi+a t)at a+t"a4 pre8ent' +an' from +orro'ion, and

t)at i' +itri+ a+id. e t)e 't"dent' on t)e met)od "'ed for te'ting t)e re'i'tan+e of +an a+/"er'

to organi+ a+id'.

. Materia'

8/13/2019 Testing for the acid resistance of lacquers

2/7

$/"ipment': Sampe:

3 ga'' =ar' it) meta +o'"re' 3 a+/"ered +an'

Meta ')ear' eagent':

Pre''"re +ooker #? a+eti+ a+id 'o"tion

#00m 8o"metri+ fa'k' #? +itri+ a+id 'o"tion

&)ermometer

@. Pro+ed"re

Preparation of reagents:

#? +itri+ a+id 'o"tion- 2#g +itri+ a+id a' di''o8ed in 300m di'tied ater and fied "p to #00m mark

in 8o"metri+ fa'k.

#? a+eti+ a+id 'o"tion- 2#m ga+ia a+eti+ a+id a' mea'"red and di"ted it) di'tied ater "p to

#00m mark in a #00m 8o"metri+ fa'k.

3 "niform pie+e' ere +"t from a a+/"ered +an.

1 te't pate 'ampe a' pa+ed in ea+) of t)e 3 ga'' =ar'. &o t)e fir't =ar, a )ot ater at A#B< a' added to

#? +itri+ a+id 'o"tion, ea8ing a C in+) )ead'pa+e. &o t)e 'e+ond =ar, )ot ater at A#B< a' added to #?

a+eti+ a+id 'o"tion. &o t)e t)ird =ar, on4 )ot ater at A#B< a' 'er8ed a' +ontro. Jar' ere 'eaed

immediate4.

&)e 3 ga'' =ar' ere pro+e''ed in a pre''"re +ooker for 90 min"te' at 120B< 52AB(6 and t)e +ooed

afterard'.

&)e 'ampe' ere kept for f"rt)er ob'er8ation'.

8/13/2019 Testing for the acid resistance of lacquers

3/7

@. e'"t'

&abe 1. $ffe+t of a+id 'o"tion' on t)e /"ait4 of a+/"er'

&4pe of

i/"id in

+ontainer

$ffe+t of a+id 'o"tion' on t)e /"ait4 of a+/"er'

$8a"ationNo $ffe+t Softening $name

ifting

t)er'

;ater *++eptabe

#?

8/13/2019 Testing for the acid resistance of lacquers

4/7

8/13/2019 Testing for the acid resistance of lacquers

5/7

ig) temperat"re a' needed on pre''"re +ooking t)e 'ampe' to a+)ie8e pre'en+e of ateration

in t)e tinpate 'ampe' t)at ere immer'ed in 3 different 'o"tion', name4, #? a+eti+ a+id 'o"tion,

#? +itri+ a+id 'o"tion and ater 'o"tion. 120B< a' t)e appied )eat a' eno"g) for t)i' p"rpo'e.

ig)er t)an 120B< o"d be +riti+a for t)e +ondition of t)e tinpate 'ampe' be+a"'e tin 'tart' to

met at 231.9B

8/13/2019 Testing for the acid resistance of lacquers

6/7

a+eti+ a+id t)at are +ontained in'ide +an' o"d be "na++eptabe d"e to )ig) probabiit4 of forming

+orro'ion.

#? +itri+ a+id 'o"tion doe' not negati8e4 affe+t a+/"er' on +an' in fa+t, if t)ere i' no a+/"er,

+itri+ a+id o"d +ean t)e meta +an. *t)o"g) ater +a"'e' +orro'ion to meta )en air i' pre'ent,

if t)ere i' a+/"er, t)en +an' i be prote+ted again't damage. a+/"er' are 8er4 important for t)e

/"ait4 of t)e +anned food' t)at e eat. *'o a+/"er' )ep food +ompanie' to 'a8e e+onomi+a4

be+a"'e it i' a perfe+t 'o"tion to one of t)e mo't diffi+"t probem' in pro8iding 'afe food' for

+on'"mer'.

@. eferen+e'

8/13/2019 Testing for the acid resistance of lacquers

7/7

&)e effe+t of +itri+ a+id on 'tee 5)ttp:II.fini')ing.+omI292I0A.')tm6

retrie8ed on September 1, 2011

http://www.finishing.com/292/08.shtmlhttp://www.finishing.com/292/08.shtml