意义及用途
4.1 Engine coolant is required to prevent heat transfer corrosion of aluminum cylinder heads during engine operation. Any corrosion products that form may be deposited on the internal surface of the radiator, reducing the heat transfer efficiency of the radiator. Overheating and boiling of the cooling system may then occur.

4.2 This test method provides a way to selectively screen unused engine coolants and easily distinguish those that are not suitable for use with an aluminum cylinder head engine. 然而, in this test method, the satisfactory performance of the coolant does not ensure adequate long-term performance. 此外, a more comprehensive evaluation should be conducted using simulation services, dynamometers, and vehicle testing to determine the long-term effectiveness of the coolant.

ASTM D4340-2019 “排热条件下发动机冷却液对铸造铝合金的腐蚀”

半径
1.1 This test method covers laboratory screening procedures for evaluating the effectiveness of engine coolants against corrosion of aluminum cast alloys under the heat transfer conditions that may exist in an aluminum cylinder head engine.

1.2 以 SI 单位表示的值应视为标准值. SI单位后括号内给出的数值仅供参考，不被视为标准值.

1.3 本标准并非旨在解决所有安全问题, 如果有的话, 与其使用相关. 本标准的使用者有责任建立适当的安全机制, 健康和环境实践，并在使用前确定监管限制的适用性. Specific precautions are given in sections 11 和 12.

1.4 本国际标准基于《关于制定国际标准的原则的决定》中确立的国际公认的标准化原则, 世贸组织贸易技术壁垒委员会发布的指南和建议.