1、BRITISH STANDARDCONFIRMED JULY 1985BS 3900-F4:1968Incorporating Amendments No.1Methods of test for paintsPartF4: Resistance to continuous salt sprayIt is recommended that this Part be read in conjunction with the general information in the Introduction to BS3900 issued separately.UDC667.61+667.613.2
2、:620.193.272and 2, andCorrigendum No.1A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.BS 39
3、00-F4:1968 BSI 2011Amendments/corrigenda issued since publicationAmd. No. Date Comments 1620 November 19742808 May 1979 Indicated by a sideline in the margin C1 January 2011 Correcting implementation of Amendment No.1ISBN 978 0 580 73245 4Summary of pagesThis document comprises a front cover, an ins
4、ide front cover, pages i and ii, pages 1 to 4 and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS3900-F4:1968 BSI 2011 iContentsPage1 Scope 12 Correlation and limitat
5、ions of test 13 Supplementary information 14 Preparation and coating of test panel 15 Apparatus 16 Test solution 27 Procedure 28 Report of test 2Figure 1 Salt spray cabinet 3Figure 2 Salt spray jet 4ii blankBS3900-F4:1968 BSI 2011 1NOTEPart F4 describes a procedure based on DEF-1053 Method No.24, “R
6、esistance to continuous salt spray”.1 Scope1.1 This Part describes a procedure for determining the resistance of single films or multicoat systems of paints or allied materials to a continuous salt water (artificial seawater) spray.2 Correlation and limitations of test2.1 In order to obtain good cor
7、relation of results between laboratories, it is necessary to observe the recommended operating conditions and to ensure the correct spacing of panels and suitable siting of the apparatus.2.2 If these conditions are observed, good correlation of results between laboratories may be obtained for period
8、s of exposure up to240hours but for periods longer than this, there may be some divergence of results.3 Supplementary information3.1 The method of test described below requires to be completed, for any particular application, by the following supplementary information. This information is to be deri
9、ved from the British Standard or other specification for the material under test or, where appropriate, is to be the subject of agreement between the purchaser and the vendor.1) Nature of substrate and method of preparation.2) Method of application of test coating to substrate.3) Thickness or weight
10、, or both, of coating and whether it is a single film or a multicoat system.4) Duration and the conditions of drying of coated panel (or conditions of storing if applicable) before testing.5) Duration of test.6) How inspection of the test coating is to be made and what characteristics are to be cons
11、idered in evaluating its resistance properties.4 Preparation and coating of test panel4.1 Unless otherwise stated use a panel approximately150mm100mm of burnished steel,1.25mm (18B.G) thick, prepared in accordance with the method described inBS3900-A3*.NOTEResults of tests carried out on different s
12、ubstrates do not necessarily correlate with each other.4.2 Coat the panel with the material under test by the appropriate method and dry for the specified time in the specified manner, if normal drying conditions are specified, these should be interpreted as a temperature of20 2 C and a relative hum
13、idity of6070% with free circulation of air and not exposed to direct sunlight.4.3 Coat the back and edges of the panel with a good protective paint.5 Apparatus5.1 The apparatus described below has been found to give consistent results and should be used for reference purposes. Other designs of appar
14、atus used under controlled conditions have been found to give results which correlate with the standard apparatus and may be used, subject to agreement between the parties.5.2 The standard apparatus consists of a glass cabinet illustrated inFigure 1 with a close fitting glass cover in which the test
15、 panels are exposed to a continuous salt mist produced by spraying the salt solution described in Clause6, through a glass jet illustrated inFigure 2. The spaces between the edges of the baffle and sides of the tank are sealed and the tank is provided with free venting.5.3 The apparatus shall be ope
16、rated so that the following conditions are observed:1) Salt spray. The salt spray is prevented by the baffle from impinging directly on the test faces of the panels.2) Solution level. The salt solution in the tank is maintained between the maximum(3 litre) and minimum (1 litres) levels indicated inF
17、igure 1.3) Spray collection. The salt solution drained from the test panels is collected in the tray and is emptied at regular intervals to prevent recirculation or contact with the panels.4) Supporting and spacing of panels. The test panels are positioned on non-metallic supports, not less than30mm
18、 apart and in the case of the outermost panels so as to ensure that they do not touch the side of the tank. The short edges of the panels are parallel to the longer dimensions of the tank with the test faces uppermost at about15 to the vertical.5) Air pressure. The air pressure to the spray jet is m
19、aintained at70 7kPa.(10 1 lbf/in2)6) Sitting of apparatus. The apparatus is sited in diffuse light, away from radiators and draughts and is operated at a temperature of20 2 C unless otherwise specified.BS3900-F4:19682 BSI 20117) Cleaning the apparatus. The apparatus, including the spray jet, is clea
20、ned periodically, at least at weekly intervals, to remove the accumulated salt deposit and is then refilled with fresh salt solution.6 Test solution6.1 The reagents used shall be of a recognized analytical quality. Distilled water or water otherwise produced of equal purity shall be used1). The comp
21、osition of the test solution shall be as given below:NOTEThe volume of solution used should be between1litre and1.5litres per24 hours.7 Procedure7.1 Expose the panel in the apparatus for the specified period.7.2 Remove the panel, wash it in running water and blot quickly with absorbent paper.7.3 Exa
22、mine the film immediately for blistering, softening and other signs of deterioration. Then immediately remove a150mm 50mm strip from the test face with a non-corrosive paint remover2). Examine the exposed metal for signs of corrosion. To preserve the panel for reference purposes, the exposed area sh
23、ould be protected by suitable transparent lacquer.8 Report of test8.1 The test report shall contain at least the following information:1) Identification of material under test.2) The British Standard, product specification or other document setting out the supplementary information required for the
24、test (seeClause3 above).3) Any deviation from the standard test procedure whether by agreement or otherwise, such as scratching through the film before exposure of panel, test temperature if other than20C etc.4) The results of the test in terms of the stated requirements.1) Water complying withBS397
25、8, “Water for laboratory use” is suitable. Sodium chloride as NaCl 26.5 gMagnesium chloride as MgCl2 2.4 gMagnesium sulphate as MgSO4 3.3 gPotassium chloride as KCl 0.73 gSodium hydrogen carbonate as NaHCO3 0.20 gSodium bromide as NaBr 0.28 gCalcium chloride as CaCl2 (to be added last) 1.1 gWater to
26、 1000 ml2) BS3761, “Water rinsable and solvent rinsable paint removers”.BS3900-F4:1968 BSI 2011 3Figure 1 Salt spray cabinet (All dimensions in millimetres)BS3900-F4:19684 BSI 201Figure 2 Salt spray jet (Not to scale)15blankBSI GroupHeadquarters 389 Chiswick High Road, London, W4 4AL, UK Tel +44 (0)
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