狠狠色丁香久久综合婷婷亚洲成人福利在线-欧美日韩在线观看免费-国产99久久久久久免费看-国产欧美在线一区二区三区-欧美精品一区二区三区免费观看-国内精品99亚洲免费高清

            上海鼎振儀器設(shè)備有限公司
            中級會員 | 第10年

            13472521719

            VOLVO STD 423 0015油漆附著力高壓噴射試驗

            時間:2019/9/24閱讀:1406
            分享:

            TEST METHOD
            Adhesion, water spraying under high pressure
            Paints and enamels
             
            Orientation
            This issue differs from issue 1 in that:
            - scribing shall be made after moisture exposure instead of before
            - calibration shall be made on low-density polyethylene plastic
            - tolerances for certain calibration parameters have been added
            - a requirement has been added stating that manual high-pressure cleaning may only be performed after agreement with Volvo
            - a number of clarifications have been made.
            1 Scope and field of application
            This test method is used for assessing the adhesion between paint films and between paint film and substrate respectively. The method is intended to simulate the strain and load that the paint films are subjected to during high-pressure cleaning.
            2 Apparatus and test object
             Test equipment of high-pressure type, brand NIFAB,
            model HTT-1, or equivalent test equipment
            Water pressure: min. 150 bar
            Spraying distance: 0-150 mm
            Sweeping frequency: 1 sweep/s
            Water temperature: 50 ± 5 °C
            Spray nozzle: (flat jet 25°) No 2506
            Lance length: 300 ± 50 mm
            Test piece holder with
            centre hole, size of hole:  40 mm
             Test object
            1) Spray nozzles meeting this specification can, for
            instance, be purchased from Spraying Systems
            Co.
            a) Test panel in accordance with STD 1021,5211 (100 x 200 mm) of the substrate in question, surface coated with the relevant paint system. A minimum of two panels shall be tested. A minimum of three crosses distributed between the two
            panels shall be tested.
            b) Test part of the relevant substrate, surface coated with the relevant paint system. In order to have significant results, test pieces should be taken from different areas on at least two test parts. A minimum of four crosses shall be tested for each part.
             Scribing tool, edge width 0,5 mm and geometry according to STD 1021,2.
             
            3 Preparation for test
            The test panels shall be conditioned in accordance with STD 1021,1. Before testing the adhesion, an initial paint damage shall be made on the test object by scribing two 0,5 mm scribe lines using a scribing tool. The scribed lines shall be made down to the
            substrate, at right angles to each other to create a cross, see fig. 1. The scribed lines shall extend outside the test area. Each scribed line shall be approx 60 mm. A cross section of a scribed line is shown in fig. 2.
            IMPORTANT – The edges of the scribed lines must
            be at right angles to the substrate. 
             



             
             

                                   Fig. 1 Principle layout / Principskiss     
             
            Fig. 2 Cross section of test piece with scribed line
             

            When the adhesion test is to be made after moisture exposure (wet adhesion), the test object shall first be exposed in a tropical cabinet in accordance with STD 423-0018 for the period specified in the requirements specification.
             
            For metal substrates, the testing shall be performed immediately after exposure, without any recovery. In practice, this means that the panels shall be stored
            maximum 60 min in a vessel filled with water of room temperature to keep them humid until testing.
            As far as plastics substrates are concerned, they shall be stored for 1 h in a constant-temperature controlled cabinet at standard atmosphere (23 ± 2 °C, 50 % RH) instead of storage in a water-filled vessel. This shall be done to allow the material to recover. The testing shall then take place within approx. 15 min.
             
            The scribing shall be made after the moisture exposure.
             
            4 Test procedure
            Place the test object in the test-piece holder. Then fix the test-piece holder’s hole ( 40 mm) centrally above the initial damage. It is important that the cross is
            correctly positioned in front of the jet, see fig. 3. The following parameters apply; the nominal values are target values:
             The water jet shall sweep over the test surface (± 20 mm) with an angle of deflection of 5,6° from the nozzle tube’s centre of rotation (N.B. No parallel displacement)
             Distance between nozzle and test surface (90°): 100 ± 3 mm
             Water pressure: 120 ± 3 bar
             Water flow: 15,0 ± 0,3 l/min
             Water temperature: 50 ± 5 °C
             Number of sweeps during 30 s: 30 ± 2
             Sweeping width: ± 20 mm (diameter of the test piece holder’s centre hole)
            Manual spraying under high pressure complying with the above parameters is also possible. This shall only be used after agreement with Volvo.
            5 Assessment
            After completed test, the object shall be wiped dry and the extension of the paint damage shall be established. The test result shall be given in per cent flaked
            paint surface. 100 % is defined as the circular area (Ø 40 mm) centred on the scribed cross, see fig. 1, (1256 mm2).
            The requirement shall be met for each scribed cross. Mean values for the entire part/panel shall NOT be calculated.
            6 Report
            The test report shall include the following:
            a) Type and designation of test material
            b) Test result in per cent (for each test object respectively). The number of rejected samples shall be noted.
            c) Testing in accordance with STD 423-0015.
            7 Calibration
            Unless otherwise specified, calibration and inspection of the nozzle’s spray pattern shall be made with an interval of 90 days.
            Calibration is performed by subjecting a test panel (approx. 100 mm x 200 mm) of low-density polyethylene as per STD 1211,05 or equivalent material to high-pressure cleaning for 30 s without the use of a test-piece holder. The nozzle must not oscillate. The following parameters apply:
             Angle between nozzle and test surface: 90°
             Distance between nozzle and test panel: 100 mm ± 3 mm
             Water pressure: 120 bar ± 3 bar
             Water flow: 15,0 ± 0,3 l/min
             Water temperature: 50 ± 5 °C
            The nozzle’s spray pattern is determined by measuring the length and width of the damage on the test panel caused by the spraying as well as checking its appearance.
             
            To be approved, the spray pattern shall be continuous, have a length of 63,0 ± 5 mm and a width of min 3,0 mm, and it shall be contained between two parallel
            lines, 7,0 mm apart (see fig. 4).


            Fig. 3 The cross mark shows schematically the position of the scribed lines in relation to the vertical flat jet



            Fig. 4 Damage from spray
             

            蒸汽噴射試驗機滿足測試規(guī)范汽車廠家:寶馬、奔馳、通用、大眾、福特、沃爾沃等規(guī)范(AA-0136、DIN 55662、ISO16925,DBL 7381,GM9531P、PV1503、VOLVO STD 423-0015,VOLVO VCS 1029 54719、FLTM BO 160-04、MS210-07,PSA D23 5376,Renault D25 2018/-A-2001 ,GMW16745-2012方法B,TPJLR-52.561-2009)

            會員登錄

            ×

            請輸入賬號

            請輸入密碼

            =

            請輸驗證碼

            收藏該商鋪

            X
            該信息已收藏!
            標簽:
            保存成功

            (空格分隔,最多3個,單個標簽最多10個字符)

            常用:

            提示

            X
            您的留言已提交成功!我們將在第一時間回復您~
            撥打電話
            在線留言