Bsi bs au 148 2 1969 (2000)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 148 2 1969 Methods of test for motor vehicle paints — Part 2 Resistance to continuous salt spray UDC 629 113 667 613 620 193 272 BS AU 148 2 1969 This British[.]

Methods of test for

spra y

U C 6 9.1 3:6 7.6 3:6 0.1 3.2 2

This Bri shStan ard, ha ing

b en a pro ed b the

Automo ileIn ustry

Stan ardsCommi e ,was

published u der the authoriy

ofthe Ex cutv Bo rd of the

Inst uton on

3 Mar h1 6

© BSI0 -2 0

The folowing BSI reference

relates to the work on this

stan ard:

Commi e reference AUE/

-Am endm ents is ued sinc publ cation

Pag e

Fig ure 1 — Salt spra ca inet for test condition T25 4

Fig ure 4 — W alk- n chamber, 1.5m b 2.5m and

This Part of this BritishStand rd has be n prep red u der the authority of the

Automobi e Industry Stand rd s Commit e an is b sed on Information S e t

No NM– 5X of the Society of Motor Man facturer and Trad er Ltd ( SMMT)

Tests for p ints for g eneral purposes are g iv en in BS3 0

1)

and , wherev er

pos ible, reference has be n ma e to that stand ard

A British Stand ard d oes not purport to include al the neces ary prov isions of a

contract User of British Stand ard s are responsible for their cor ect a plcation

Compl anc with a British Standard does not of itself confer im m unity

f om leg al o l g ations

1)

BS3 0 , “Method s of te t for paints”

Sum mary of pag es

This document comprises a f ont cov er, an insid e font cov er, p g esi andi ,

p g es1 to7 an a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

amendments incorporated This wi l be indicated in the amendment ta le on the

inside f ont cov er

1 Scope

1.1 This Part of this BritishStand rd des ribes a

procedure for d etermining the resistance of p int

fims to a continuous salt fog env ironment.Two test

cond itions, difering only in temperature of

operation, are g iv en:

1.2 The stand ard d oes not pres ribe period s of test,

nor the interpretation to be g iv en to the results

2 Corr la tion and l mitations oftest

In ord er to obtain g ood reproducibi ity betwe n

la oratories, it is neces ary to observ e the

recommended operating conditions, cor ect sp cing

of an positioning of specimens and to ensure

suita le siting of eq uipment Suita le forms of

equipment which ma be used to obtain the req uired

cond itions are refer ed in5.1 Results fom other

desig ns of eq uipment hav e be n found to cor elate

an such equipment ma be used, subject to

ag re ment betwe n the pur haser and the sup l er

The folowing sup lementary information,tog ether

with reference to a propriate stand rds where

a pl ca le,is req uired in ord er to car y out the tests

d es ribed in this stand rd :

1) Ty pe of coating or coating s

2) Nature of substrate and method of

prep ration

3) Method of a pl cation of test coating or

coating s to substrate

4) Thick es and/or weig ht of coating , or of

ind iv idual coating s in the case of multicoat

systems

5) Duration and cond itions ofdry ing of the coated

specimen ( or cond ition of stov ing , if a pl ca le)

before testing

6) Required duration of test and test conditions

( T25 or T3 )

7) How inspection of the tested coating is to be

mad e and what characteristic are to be

considered in ev aluating its resistance to this

test

4 Test specimens

4.1 Specimens for test wi l g eneraly be p nels

prep red and coated with the materials to be tested,

but for some purposes ( for ex mple qualty control

tests) p inted components, or suita le portions of

them, ma be req uired

W here components are to be tested it is important to

select samples which are f e f om ac idental

d amag e I this is impractica le, or if the test portion

is cut fom a larg e sample, d mag ed areas or cut

ed g es etc shal be cov ered with a g ood protectiv e

coating

4.2 Preparation and coating oftest panels

4.2.1 Panels, 15 mm×10 mm or other conv enient

siz , specified and pretreated in ac ord nce with the

requirements of BS3 0 -A3

2)

( note p rticularly

Clause2.2) shal be coated in ac ord ance with the

requirements of BS3 0 -A4

2)

with the p int sy stem

to be tested Normal y , ste l p nels are used, but it

ma be a propriate to use other substrates

4.2.2 The p nels shal be ag ed , u der normal

la oratory conditions, for7d ay s, unles otherwise

ag re d

4.2.3 I the specimen p nel is not coated on al

sur aces with the material u d er test, coat the b ck

and ed g es of the p nels with a g ood protectiv e

coating

4.2.4 Unles otherwise ag re d , the test p nel shal

be d amag ed with a s riber b making2 long itudinal

s ratches, 0.6mm wid e, throug h to the metal

substrate They shal extend at least& of the leng th

of the p nel and shal be positioned central y in each

v ertical half The s riber used shal be ma e f om

mid ste l0.6mm thick an sha ed to g iv e a chisel

edg e ca a le of making the req uired s ratches

5.1The eq uipment req uired consists of a chamber, a

salt solution reserv oir, a sup ly of suita ly

conditioned compres ed air, one or more atomizing

no zles, specimen sup orts, prov ision for heating

the chamber and neces ary means of control The

siz and detaied construction of the eq uipment are

optional, prov id ed the conditions obtained me t the

req uirements of this test

It is important that the chamber shal be insulated

to av oid temperature g rad ients, p rticularly with

test condition T3 W ith smal ca inets, this is

conv eniently efected b means of a d ouble skin

construction, incorporating a water jacket for

temperature control

Test cond ition T25: temperature25±2°C

Test cond ition T3 : temperature3 ±2°C

2)

BS3 0 ,“Method s of te t for paints”,

Part A3,“Pr epar aton of pa els pr ior to paintn ”,

Part A4,“Note for g id anc on paint ap lcaton”

A suita le form of test equipment for test

cond itionT25 is shown inFig ure 1 andFig ure 2

Equipment suita le for test condition T3 is

i lustrated inFig ure 3 andFig ure 4

5.2 Drops of solution which fal f om the specimens

shal not be returned to the solution reserv oir for

respray ing

5.3 Materials of construction shal be such that they

wi l not afect the cor osiv enes of fog Glas ,rub er

or certain plastic materials ( or lning s there f) are

suita le

5.4 The spra f om the atomizing no zle, or no zles,

shal be prev ented f om imping ing on the test

specimens b means of suita le b fles The solution

cond ensing on the b fles ma be returned to the

salt solution reserv oir; this can efect a substantial

economy in rate of consumption of the solution

Adjusta le b fles are of as istance in obtaining a

uniform col ection rate throug hout the test z ne of

the chamber ( se 9.2)

5.5 The equipment shal be sited so as to be in

d ifused l g ht and awa fom rad iator or other

sour es of heat, and d raug hts, in order to faci tate

temperature control

6 Position ofspecimens during test

6.1 Unles otherwise specified , the specimen shal

be sup orted so that the test sur aces are

betwe n15° and3 ° f om the v ertical and

prefera ly p ralel to the princip l direction of

horiz ntal flow of fog throug h the chamber In the

case of components of complcated sha e, sev eral

specimens ma be required , so that al sig nificant

suraces are ex osed substantialy in this way

Alternativ ely , b ag re ment,the component ma be

placed in the position in which it wi be as embled

in serv ice In al cases, the test sur ace shal be at

least3 mm fom any other specimen an at

least3 mm fom any wal of the chamber

It is recommended that, to obtain reasona le

reprod ucibi ty of test, the ca inet be ru at ful

ca acity to ensure ev en d isper ion of fog This ma

be achiev ed, when testing flat p nels, b

introducing blan s mad e of inert material

3)

of the

same dimensions

The position of p nels in the ca inet should be

v aried , throug hout the test period, ev ery24hour

6.2 The specimens shal not contact any material

ca a le of acting as a wick

S ita le materials for the construction or coating of

racks or sup orts are g las , rub er, certain plastic

materials or suita ly coated wo d.Bare metals shal

not be used

6.3 Each specimen shal be placed so as to permit

fe set lng of fog on al specimens

6.4 Salt solution f om one specimen shal not be

alowed to drip on to any other specimen

7 Test solution

The test solution shal be prep red as fol ows:

Dis olv e5 ±5g sodium chlorid e, comply ing with

BS9 8 “ Va cu m sa lt fr buter a nd che s ma king”,

in each l tre of d isti ed or d e- oniz d water or water

containing les than10 p.p.m of total dis olv ed

sol ds and substantial y fe fom d is olv ed heav y

metals, p rticularly nickel, cop er and iron The pH

of the solution shal be such that when atomiz d

u der the test conditions, the colected solution

( se 9.2) wi hav e a pH6.5–7.2

8 Air supply

8.1 The compres ed air sup ly to the no zle or

no zles for atomizing the salt solution shal be fe

fom oi, oi v apour and dirt and maintained

betwe n0.6 b r and1.72 b r

)

8.2 The air shal be saturated with moisture b

means of a water wash or h mid ify ing tower, after

suita le fi tration It is prefera le to operate the

tower at temperatures wel a ov e the chamber

temperature to ensure wet fog , to ofset heat los es

an to maintain the req uired temperature in the

chamber The tower temperature should be ad justed

so that both the col ection rate (se 9.2) and

composition of col ected fog ( se Clause7) are kept

within the specified l mits For g uid nce, the

fol owing ta le shows the tower temperatures at

diferent air pres ures req uired to ofset the co l ng

efect of ex ansion at the no zle or no zles to

atmospheric pres ure for test condition T3 :

The no zle or no zles ma be operated

intermit ently b means of a suita le timer an

rela actuating a solenoid v alv e in the air sup ly ,

prov iding that the fog is maintained contin ously

( e.g air pres ure3s on, 7s of) This prov id es

means of a justing the colection rate ( se 9.2) and

it also ensures a more consistent fog distribution

with minimal directional efects

3)

An e ample of a suia le material is “Per p x”

4)

1b r=1

5

N/ m

2

9 Test conditions

9.1 Tem perature The ex osure z ne of the test

chamber shal be maintained at the fol owing

temperatures:

9.2 Atom ization and quantity of fog At least two

clean fog col ector shal be placed in the ex osure

z ne in the prox imity of the test specimens, one near

to a no zle and another as far as pos ible f om a

no zle They shal be positioned so that no test

solution fal ing f om the test specimens is colected

The fog shal be such that for each80 0mm

2

of

horiz ntal col ecting area there wi be colected, in

each colector, f om 1.0–2.0ml of solution per hour,

d etermined ov er an operating period of at least16h

The colected spra solution shal

contain5 ±10g /l of sod ium chlorid e ( specific

g rav ity1.025 –1.0 0 at25°C) and pH shal

be6.5–7.2

NOT Stan ard la oratory g las fu nels or dishes wih a

diameter of1 0mm ha e a horizontal are of80 0mm

2

The fol owing procedure shal be car ied out:

1) Ex ose the specimen in the ca inet for the

specified period

2) Remov e the specimen, wash in cold ru ning

water, an dry of

3) Ex mine the sur ace immediately for cor osion

of the substrate, spread of cor osion and los of

ad hesion at the s ribed l nes, bl stering , softening

of the p int, or other sig ns of deterioration Then

immed iately after, remov e a15 mm×5 mm

strip of p int fom the test face with a

non-cor osiv e p int remov er comply ing with

BS3 61

5)

Ex mine the ex osed substrate for

sig ns of cor osion To protect the p nel for

reference purposes, the ex osed area shal be

protected b a suita le transp rent lacq uer or

ta e

4) Unles otherwise ag re d , any g eneral los of

ad hesion of the p int fi m to the substrate, or

betwe n coats, shal be determined b the c os

hatch and / or ta e a hesion test ( as Part3

6)

of

this stand ard) within13–15min of remov ing

the specimen f om the ca inet

11 Report oftest

The test report shal contain at least the folowing

information:

1) Id entification of material u der test

2) The product specification and any other

sup lementary information req uired for the test

( se Clause3)

3) Any d ev iation, b ag re ment or otherwise,

f om the stand rd test procedure

4) The results of the test in terms of the specified

req uirements

Test cond ition T25: 25±2°C

Test cond ition T3 : 3 ±2°C

5)

BS3 6 ,“Wate r insable a d solvent r insable paint r emo er s”

6)

BS AU1 8-3, “Flexibi ty a d ad he ion”

( All dimensions in milimetres)

Fig ure 1 — Salt spray cabinet for test condition T2

(

F Ang le of lid, 9 ° to 1 5°

1 Thermometer an thermostat for controling he ter ( Item No.8) in b se

2 Automatc water le eling de ice

3 Humidifying tower

4 Automatc temp rature reg ulator for controling he ter ( Item No 5)

5 Immer ion he ter,non-rustng

6 Air inlet,multple o ening s

7 Air tub to spra noz le

R Strip he ter in b se

9 Hing ed to , hydraulicaly o erated, or cou terb lanced

1 Brackets for rods sup ortng sp cimens, or test ta le

1 Internal reserv ir

1 Spra noz le a o e reserv ir, suia ly desig ned,located,an b fled

1 A Spra noz le housed in disp r ion tower located prefera ly in centre of ca inet

1 W ater se l

1 Combinaton drain an e haust Exhaust at o p sie side of test sp ce fom spra noz le ( Item 1 ), but prefera ly in

combinaton wih drain, waste tra ,an for ed draft waste pip ( Items 1 , 1 , an 1 )

1 Complete se araton b twe n fored draft waste pip ( Item 1 ) an combinaton drain an e haust ( Items 1 an 1 ) to a oid

u desira le sucton or b ck pres ure

1 Fored draft waste pip

1 Automatc le eling de ice for reserv ir

1 W aste tra

2 Air sp ce or water jacket

2 Test ta le or rack, wel b low ro f are

Fig ure 3 — Salt spra ca inet for test condition T3

NOT The controls are the same, in g eneral, as for the la oratory ca inet( Fig ure 3), but are sized to care for the larg er cub

The chamb r has the folowing fe tures:

1) He v insulaton,

2) Refig eraton do r wih drip rail, or pres ure do r wih drip rail,inward slo ing sil,

3) Low temp rature auxiliary he ter, an

4) Duck b ards on flo r, wih flor slo ed to combinaton drain an air e haust

Fig ure 4 — Walk- n chamber, 1.5m by2.5m and upward in o eral size for test condition T3

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