1、ASD STANDARD NORME ASD ASD NORM prEN 4170 Edition P 1 February 2006 PUBLISHED BY THE AEROSPACE AND DEFENSE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Gulledelle 94 - B-1200 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: Descriptors: ENGLISH VERSION Aerospace se
2、ries Paints and varnishes Test method for measurement of resistance to cold crack temperature cycle Srie arospatiale Peintures et vernis Mthode de test pour mesurer la rsistance aux cycles de basse temprature Luft- und Raumfahrt Anstrichstoffe Bestndigkeit gegen thermische Kreislufe This “Aerospace
3、Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The Aerospace and Defense Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain followi
4、ng member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD
5、-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standa
6、rd and by withdrawing any national standards conflicting with the EN. Edition approved for publication 28 February 2006 Comments should be sent within six months after the date of publication to ASD-STAN Non-metallic Material Domain Copyright 2006 by ASD-STAN prEN 4170:2006 2 Foreword This standard
7、was reviewed by the Domain Technical Coordinator of ASD-STANs Non-metallic Material Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. Contents Page 1 Scope . 3 2 Pri
8、nciple 3 3 Apparatus 3 4 Specimen. 3 5 Procedure 3 5.1 General. 3 5.2 Cold crack cycle 4 6 Results 5 7 Designation. 5 8 Test report 5 Bibliography 6 prEN 4170:20063 1 Scope This standard describes a procedure of ageing to assess the resistance of a coated panel (metallic or organic substrate) to a t
9、emperature cycle (cold, hot, hot and wet) for aerospace purposes. This test deals with the assessment of the capability of the paint to support modification of internal stresses without any crack formation, peeling or other defects due to modification of the mechanical properties of the paint system
10、. 2 Principle The principle of the method is to create, using a temperature cycle (see 5.2), a periodic fatigue of the paint applied on a given substrate (fatigue of the interfaces or the paint itself). Generally failures occurring are: loss of adhesion; cracks if the energy due to internal stress d
11、evelopment is greater than the cohesive strength of the paint; loss of flexibility, gloss; blistering. 3 Apparatus Climatic chamber: capable of reproducing the temperature cycle define in 5.2 or other required cycle. 4 Specimen The panels for the determination of the properties after the ageing proc
12、ess are selected and treated according to the material specification. The tests are indicated in the material specification. Paint system is applied according to the manufacturers instructions (viscosity, overcoating time). 5 Procedure 5.1 General After the drying period defined in the material stan
13、dard: If required gloss and colour are measured using relevant test method; The test panels are exposed vertically in the climatic chamber. A distance of 2 cm should separate successive panels. Unless otherwise the duration of the test is defined by the number of cycles: 30. prEN 4170:20064 5.2 Cold
14、 crack cycle See Figure 1. Figure 1 All temperatures are given with an accuracy of 1 C. All relative humidity are given with an accuracy of 10 % RH. The thermal cycle is described hereafter: panels are exposed for 18 hours in a (50 1) C/(90 10) % RH atmosphere, at a rate of 2-30 C/min, the atmospher
15、e is cooled to 55 C, the temperature is controlled for 2 hours at ( 55 1) C, the ambiance is quickly heated up to (80 1) C at 10 C/min, the temperature is controlled for 2 hours at (80 1) C, at a rate of 10 C/min, the atmosphere is cooled to 55 C, the temperature is controlled for 2 hours at ( 55 1)
16、 C, the atmosphere is heated up to (50 1) C and (90 10) % at a rate of 2 C/min to 3 C/min. prEN 4170:20065 6 Results Requirements and test methods are defined in the material specification. The evaluation of the results and test procedures are described in the relevant test methods. 7 Designation EX
17、AMPLE Description block RESISTANCE TO THERMAL CYCLES Identity block EN4170 Number of the standard 8 Test report a) designation; b) date; c) thermal cycle; d) paint system; e) batch numbers; f) reference; g) application device; h) drying time and temperature, relative humidity; i) overcoating time; j
18、) thickness of the dry film; k) thickness of the different layers; l) results; m) results and requirements; n) gloss; o) colour; p) defects. prEN 4170:20066 Bibliography 1 ISO 1513, Paints and varnishes Examination and preparation of samples for testing. 2 ISO 3696, Water for analytical laboratory use Specification and test methods.
