의미와 용도

5.1 산성 부식 손상은 자동차 회사의 중요한 보증 청구 항목입니다.. 그러므로, 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 크세논 아크 노출 장치를 사용한 자동차 바니시의 산성 에칭 가속화를 위한 표준 테스트 방법

단계 1: 범위

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 mm [0.5 ~에] 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 ~에] in diameter. 3

메모 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 Values expressed in SI units or inch-pound units shall be treated separately as standard values. The values stated in each system may not be exactly equivalent; 그러므로, 각 시스템은 독립적으로 사용해야 합니다.. Combining values from two systems can result in non-compliance.

1.5 이 표준은 모든 안전 문제를 해결하기 위한 것이 아닙니다. (만약에 어떠한) 그 사용과 관련된. 적절한 안전 및 보건 관행을 확립하고 사용 전에 규제 제한의 적용 가능성을 결정하는 것은 이 표준 사용자의 책임입니다..