评估冷却系统软管套电阻的测试方法

[中文适用范围]： 本测试方法提供了评估汽车冷却液软管覆盖层电阻的标准程序。已知发动机和散热器之间存在电位差。当车辆制造变化允许软管或夹具与散热器和发动机上的金属部件接触从而完成电路时，冷却液软管覆盖层的导电性已被确定为降低软管夹具寿命的因素。由此产生的电流会破坏夹具的保护涂层，使其容易受到道路盐分、湿气和其他环境污染物的腐蚀影响。SAE推荐实践J1684解决了冷却液软管管体部分的电化学电阻问题。 [外文原描述]： This test method provides a standardized procedure for evaluating the electrical resistance of automotive coolant hose covers. It is known that an electrical potential exists between the engine and the radiator. Coolant hose cover conductivity has been determined to be a factor to reduce hose clamp life when vehicle build variations allow possible contact of the hose or the clamp to metal components on the radiator and engine thus completing an electrical circuit. The ensuing electrical current can undercut the clamp protective coating, leaving it vulnerable to the corrosive effects of road salts, moisture, and other environmental contaminants. SAE Recommended Practice J1684 addresses the electrochemical resistance of the tube portion of the coolant hose.Cross Reference: ASTME177,ISO17025,J1684_201811