משמעות ושימוש

5.1 Acid corrosion damage is an important warranty claim item for automobile companies. לָכֵן, acid etching resistance is an important parameter of automotive exterior wall coatings. The method described in this test method has shown to mimic the acid etch damage of automotive varnish that occurs when these coatings are exposed in Jacksonville, Florida, from May to mid-August. 3,5 The accelerated test described in this standard allows for year-round testing instead of limited outdoor exposure times available for exposure in Jacksonville, Florida.

ASTM D7356M-2013 Standard Test Method for Accelerated Acid Etching Weathering of Automotive varnishes Using xenon Arc Exposure Devices

שלב 1: תְחוּם

1.1 This test method includes accelerated exposure tests designed to simulate defects causing acid rain in automotive finish paint 2 occurring at exposure sites in Jacksonville, Florida. Etching defects from external exposure at acid rain test sites in Jacksonville, Florida range from small pit diameters to acid etch spots of 12.7 מ"מ [0.5 in] or larger. The latter type of defect does not occur in other acid etching tests that only produce pits less than 6.35mm [0.25 in] in diameter. 3

הערה 1 – Digital images of acid etching defects produced during outdoor acid rain exposure and accelerated tests described in this test method are shown in Appendix X1.

1.2 The accelerated tests described in this test method use xenon arc sources with daylight filters that meet the requirements of Practice G155. Sample spraying with a simulated acid rain solution requires the use of a horizontally flat sample array so that the acid rain solution remains on the sample for a long time.

1.3 There is no known ISO equivalent to this test method.

1.4 ערכים המבוטאים ביחידות SI או יחידות אינץ'-פאונד יטופלו בנפרד כערכים סטנדרטיים. The values stated in each system may not be exactly equivalent; לָכֵן, יש להשתמש בכל מערכת באופן עצמאי. שילוב ערכים משתי מערכות עלול לגרום לאי התאמה.

1.5 תקן זה לא נועד לתת מענה לכל חששות הבטיחות (אם בכלל) הקשורים לשימוש בו. באחריות המשתמשים בתקן זה לקבוע נוהלי בטיחות ובריאות מתאימות ולקבוע את תחולת ההגבלות הרגולטוריות לפני השימוש.