1、c CEN EN*a32L %5 3404589 OLL5362 472 BRITISH STANDARD AEROSPACE SERIES Paints and varnishes - Corrosion test by alternate immersion in a buffered sodium chloride solution The European Standard EN 3212 : 1995 has the status of a British Standard ICs 49.040.10 UDC 667.61 : 620.193 : 629.7 BS EN 3212 :
2、 1995 BS EN 3212 : 1995 Amd. No. Date ixt affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Bchnical Committee ACE/44, upon which the following bodies were represented: Aluminium Finishing Association British Coatings Federation Ltd.
3、Metal Finishing Association Ministry of Defence National Centre of Tiibology Oil and Colour Chemists Association Society of British Aerospace Companies Limited This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the St
4、andards Board and comes into effect on 15 December 1995 0 MI 1995 Amendments issued since publication The following MI references relate to the work on this standard: Committee reference ACE/44 Draft for comment 89/8337 DC ISBN O 68 23704 4 , . CEN ENw3232 75 3404589 0335364 245 BS EN 3212 : 1995 Co
5、ntents Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Rst solution 3 6 Rst pieces 3 7 Procedure 4 8 Test report 4 9 Designation 5 Annexes A (normative) Position of cuts 6 B (normative) Shaw of cuts 7 i BS EN
6、3212 : 1995 National foreword This British Standard has been prepared by Technical Committee ACE/44 and is the English language version of EN 3212 : 1995 Aeroqmce series - hints and varnishes - Corrosion test by altemu;cte immersirm. in a hflered sodium chbride solution, published by the European Co
7、mmittee for Standardization (CEN). EN 3212 was produced as a result of international discussion in which the United Kingdom took an active part. Cross-references Publication referred to Corresponding British Standard Group H Evaluation of paint and varnish defects part H1 : 1993 Designation of inhms
8、ity, quantity and SiXe of common types of defect: general principles and rating schema ES EN 2633 : 1994 Aluminium alloyimetres : 100x40x0,8to2 Unless otherwise specified, test pieces shall be sensitized to intergranular corrosion by holding them for 1 h at (495 f 2) C in an oven followed by quenchi
9、ng in boiling water. The coating is specified in the standards for paints and varnishes. Page 4 EN 3212 : 1995 CEN EN*3212 95 = 3404589 OLL5369 827 7 Procedure Make cuts in the test pieces in accordance with annexes A and/or B. Attach the test piece to the test device by means of insulating material
10、. Immerse the test piece so that it is surrounded by at least 10 mm of the test solution. If there are several test pieces in a chamber, the distance between the test pieces shall be at least 10 mm. The volume of the solution shall be 4 ml/cm* of the test pieces surface. A cycle comprises 2 h of imm
11、ersion and 2 h of emersion. The level of the test solution shall be maintained constant by adding distilled or deionized water. The test solution shall be renewed twice during the first week, then every ten days. Visually examine the test pieces at regular intervals and at the end of the test and re
12、cord any appearance of blisters or corrosion. On completion of the test, the test piece shall be : - rinsed in distilled or denionized water : - dried with absorbent paper or a cloth ; - examined visually so as to assess the degree of blistering in accordance with IS0 4628-1. Measure the extent of a
13、ny corrosion on both sides of the cut. Perform any test required by the standards for paints or varnishes. 8 Test report It shall include the following : - designation of the test ; - identification of the paint or varnish ; - preparation of surface and application and drying conditions of the paint
14、 or varnish ; - coating thickness : - testperiod; - dateof test ; - deviations from this standard. CEN EN83212 95 3404589 0335370 549 Page 5 EN 3212 : 1996 9 Designation EXAMPLE : EN321 2 A IT Numbe, of this standard Cut shape (see annex 8) _ CEN EN*32L2 95 = 3404589 OLL5371 485 Page 6 EN 3212 : 199
15、6 Test piece Annex A (normative) Position of cuts CEN EN*32l12 95 = 3404589 0115372 311 Page 7 EN 3212 : 1995 Annex B (normative) Shape of cuts The cut edges shall be clean. Shape A 0.6 mm f 0.1 mm _I Shape B 75 f 2 0,6 mm f 0.1 mm 1 - Paint or varnish Substrate - Paint or varnish - Substrate CEN EN
16、*3212 95 D 3404589 OLL5373 258 D BS EN 3212 : 1995 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Engineering Sector Board to Rchnical Committee ACE/44 upon which the following bodies were repr
17、esented : Aluminium Finishing Association British Coatings Federation Ltd. Metal Finishing Association Ministry of Defence National Centre of Tribology Oil and Colour Chemists Association Society of British Aerospace Companies Limited National annex NB (informative) Cross-references Publication refe
18、rred to IS0 4628-1 1982 Corresponding British Standard BS 3900 Evaluation of paint and varnish hfects Part Hl : 1993 Designation of intensity, quantity and size of common types of defect: general principles and rating schemes BS EN 2633 : 1994 Aluminium alloy A L-P2024-T3511 - Extruded bars and sect
19、ions 1,2 mm 5 a or D I 150 mm with peripheral coarse grain control EN 2633 : 1993 BS EN 3212 : 1995 BSI 389 Chiswick High Road London W4 4AL 9512- 6- 0.5k- FP BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view
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