Coating Defects-Trouble Shoot of Application Problems - Eric Chia
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8/9/2019 Coating Defects-Trouble Shoot of Application Problems - Eric Chia
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For internal use only not to be circulated outside AkzoNobel
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Trouble shooting of application issue
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
We have taken reasonable care in preparing this training material (the Material) and in collectingand preparing material for inclusion in it but do not represent or warrant that it is free from error orthat the information content is complete or accurate. The information is advisory only and the use ofthe Material is solely at your own risk.
n the event that the Material contains print!outs of presentations" please note that the Material doesnot necessarily stand on its own and is not intended to be relied upon in specific circumstances.
t is your responsibility to be aware of relevant current national" state and international laws andregulations that affect or may affect your activities or operations. The Material is not intended toprovide comprehensive coverage of such laws and regulations.
To the e#tent permitted by law" we do not accept any liability to any person for any loss or damage(direct or indirect) that may arise from any use of or reliance on any of the methods or informationcontained in the Material for any purpose.
f you wish" you may take copies of the Material for your own use but all copies must carry thisimportant notice.
$ %k&o 'obel" *. %ll rights reserved
Disclaimer
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
!ood Application " !ood Perfor#ance
Assu#ing the specification is approved and confir#ed
A final revie$ of specification #ight be re%uired
Follo$ing the application guidelines $ill ensure
opti#u# perfor#ance
ife expectancy $ill be achieved
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Paint #ixing prior to application
'efore #ixing Part A & ' should be heated(
Mechanical stirrer reco##ended for efficient #ixing(
Mix Part A co#pletely
o#bine entire contents of Part ' and #ix thoroughly(
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Paint re%uire#ents for single leg
!uidance $ithout the use of heater block or trace heatedlines
Individual co#ponents should be pre)heated
'ase *+
uring Agent *,
Mixed paint should be - *+)*.
/he Paint lines should be insulated to #aintain paint
te#perature
0eater block or trace heated lines is another option forlo$ te#peratures
1olvent 23 .45 should be available for cleaning of
e%uip#ent in the event of any spray difficulties
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Paint re%uire#ents for plural co#ponent
!uidance $ithout the use of heater block or trace heatedlines
Individual co#ponents should be pre)03A/36
'ase - *+
uring Agent - *,
o#ponents should be 03A/36 in the tanks as directed
on /61
/he Paint lines should be insulated to #aintain paint
te#perature 0eater block or trace heated lines is another option for
lo$ te#peratures
1olvent 23 .45 should be available for cleaning of
e%uip#ent in the event of any spray difficulties
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Application onditions
1teel te#perature Mini#u# -4,>
Maxi#u# steel te#perature? - +,>
Air condition
7elative hu#idity should be controlled
7educed final syste# perfor#ance a#ine
bloo#
Potential for reduced intercoat adhesion in
#ulticoat sche#es
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
!ood ;1 Poor 1tripe oat application
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Pit Filling
/he action of the pit filling is to force the#aterial into the pit re#oving all air pockets
/his is carried out $ith a s%ueegee $ith 1F
#aterial before application of the sche#e
/his is best for open pitting
9se of a s%ueegee $ill not co#pletely fill
o#ega pitting
/hese should be opened up by grinding or
repaired using $elding
onventional8#ega
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Pit Filling
=hen using the spray)s%ueegee techni%ue
1pray #aterial
1%ueegee the product over the pits
Allo$ to flo$ into pits for - + #inutes
1pray the full coat over this area
/his gives better cos#etic appearance and pit)filling
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
1hutting 6o$n
All e%uip#ent should be thoroughly flushed $ithcorrect cleaning solvent
3 .4 for 3nviroline
8ther cleaners are not suitable and $ill not clean
1trip e%uip#ent do$n 2if necessary5 at the end of eachday and either?
1teep in solvent overnight
Pressure $ash co#ponents to re#ove all paint
residues
If leaving paint in t$in feed e%uip#ent allo$ to cool
under stirring before transport
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Coating defects
'y understanding the causes of defects@ $e canprevent #any(
It is i#portant to understand that #any defects are
inter)related(
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
Causes of Coating Defects
45 Poor 1urface Preparation
1urface conta#ination
1urface profile
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
5 Poor Application
Mixing 24)pack & )pack5
9se of brush & roller 2lo$ dft per coat5
9se of spraying 2lo$ or high dft per coat5
Causes of Coating Defects
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
*5 Inco#patible Paint 1yste#s eg )pack over 4)pack syste#s
B5 Incorrect syste# for the environ#ent eg Anticorrosive or Antifouling perfor#ance needs
+5 Poor 3ngineering 6esign Inherent design defects 2eg stitch $elding5
Causes of Coating Defects
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
6ry 1pray
/o coalescence and for# a continuous fil#@ paint
#ust still be fluid $hen it reaches the surface(
Target steel
(panel, ship etcSpray
!"n
#et Paint mergingfrom s ra ti .
$vapo"ration of solvent fromatomised droplets before they
can reach the s"rface..
Specific Defects - Application
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
1agging & urtaining =eight of paint on a surface is too #uch for the flo$
properties of the paint to support@ due to?)
a5 /oo high thickness applied(
b5 /oo #uch thinner added to the paint(
c5 Not enough thixotropy for expected $ft(
d5 /e#perature too lo$ C solvent too slo$(
Specific Defects - Application
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
0ot 1urface Failure
1urface te#perature of hot ite#s is not al$ays
kno$n@ so difficult to specify coatings(
3arly failures include the follo$ing?)
a5
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
halking
o##on for epoxies@ as 9; degradation of the resin at the surfacecauses breakdo$n and the release of pig#ent particles(
It is a surface effect only@ and not associated $ith a true failure(
0o$ever@ surface dust #ust be $ashed off before applying further coats(
Specific Defects - Inherent
9; ight
ong
3xposure
9; ight
Most of the coating
is not affected
/he upper layer
is broken do$n
by 9; light
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
'listering
aused by?)
painting over #oisture
painting over soluble salts
solvent entrap#ent
coating per#eability to gas
excessive athodic Protection
painting over porous surfaces
Specific Defects Various Causes
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
orrosion
Remember :- Paint does not rust!"
aused by?)
re#oval of coating by #echanical action(
lo$ fil# thickness
poor surface preparation
Specific Defects Various Causes
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
racking
Fracture of at least the topcoat of paint $ith ageing@
and occurs $hen the substrate and coating expand
and contract at different rates(
As paint fil#s age@ they beco#e harder and less
flexible and so E1o#ething has to give(
/hin fil#s tend to crack less than thick fil#s(
Specific Defects Various Causes
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
racking
1teel and
coating layers
expand and
contract at
different rates
Many
te#peratur
e cycles
Specific Defects Various Causes
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
racking due to inco#patible
syste# being applied over an
aged intact coating
racking caused byexcessive dft due to
repeat applications over
#any years
Specific Defects Various Causes
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
a5 Poor surface preparation or care on application(
b5 Painting over poorly adhered paint(
c5 9se of inco#patible #aterials in a syste#(
d5 3xceeded overcoating intervals(
e5 Incorrect #ixing for )packs(
f5 Application in unsuitable conditions(
g5 Painting at excessive thickness(
h5 Application beyond Pot)ife
Possible Causes of Detachment
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
9pdate 3nviroline application
0ave done 3nviroline application trial run $ith
!racoHM)., plural application in 'P Angola in urong
shipyard on 4JC4K Aug ,4,
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
9pdate 3nviroline application
6uring application of 3nviroline B,+0/ 6uring application of 3nviroline *.LF)L,
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
9pdate 3nviroline application
1praybility $as good but so#e dra$back due to?
1pray stripe coat on difficult to accessCinaccessibleareas 2scallop holes@ edges of stiffeners@ $elds@ etc5(
1hort pot lives of the products 2*.LF)L, in +#ins and
B,+0/ in B+#ins at +deg(5 render difficulty during
stripe coating by brush(
8vercoating interval of #axi#u# Lhrs is not sufficient
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
3*, application on sea$ater desalination
vessel in Naning 6ec ,4,
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
3nviroline 4B application on pipe in Malaysia)
,4*
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Marine & Protective oatingsFor internal use only not to be circulated outside AkzoNobel
earning experience fro# site application
Purely used air)hose for spraying e%uip#ent)not sharing $ith
blasting hose
9se a standalone co#pressor to ensure 4,,psi input@ J,psi during
spray application
Pre)heat the individual co#ponent to *+deg(
'oth P/A & P/' re%uired agitate $hen spray using plural
co#ponent
irculate the #ixed #aterial back to the dru# to achieve B,deg( at
tip $hen using single airless spray
1trip coat by plural spray @follo$ by brushing(
0eated tracing line or insulate the line
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