碳纤维增强塑料（CFRP）和保护涂层金属组装形式电偶腐蚀速率的测定 中性氯化钠溶液中的电化学测试

[中文适用范围]： 1.1 本文件规定了在电解质通过涂层扩散的腐蚀环境下，用来确定碳纤维增强塑料和带保护涂层的金属组件的电偶腐蚀速率的电化学试验。它规定了进行电化学试验时要使用的设备、试验溶液和程序，用于 a) 评估金属材料保护涂层的菲克扩散参数，以及 b) 根据 ISO 21746 无涂层样品数据转换估算电偶腐蚀速率。1.2 根据本文件实施电化学试验的预期情况如下：a) 当相关方利用 ISO 17475 的资源估算与带保护涂层的工程金属和电位远高于大多数金属的碳纤维增强塑料相关的粘合接头的电偶腐蚀速率时；b) 当将使用涂层的碳纤维增强塑料-金属粘合接头应用扩展到电解质引起的腐蚀敏感环境领域时。1.3 本文件的目的并非满足以下需要： — 省略与腐蚀环境应用相关的现场测试； — 将特定应用的测试数据叠加到相关数据范围内； — 进行比较测试，作为对不同防护措施在腐蚀速率方面的排名的一种方式； — 忽略侵蚀、磨损和紫外线照射等现场危害。 [外文原描述]： This document specifies the electrochemical test for determining galvanic corrosion rate of CFRPs and metal assemblies with protection-coating, subjected to the corrosive environment of electrolyte diffusion through the coating. It specifies the apparatus, the test solutions, and the procedure to be used in conducting the electrochemical tests for a) the assessment of the Fick's diffusion parameter for protective coating on metallic materials, and b) the estimation of the galvanic corrosion rates with the conversion of ISO 21746 coating-free sample data. The following are intended situations of implementing an electrochemical test based on this document: a) when interested parties estimate the galvanic corrosion rate of bonded joints relating engineering metals with protection-coating and CFRPs of the potential drastically nobler than those of most metals, utilizing the resources of ISO 17475; b) when expanding CFRP-metal bonded joints applications using coatings to the fields of corrosion-sensitive environments caused by electrolytes. It is not the intent of this document to fulfil the need for: — omitting relevant field tests for the applications in corrosive environment; — superimposing test data for specific applications for the range of relevant data; — comparative testing as a means of ranking different protections with respect to corrosion rates; — ignoring the field hazards such as erosion, abrasion, and ultraviolet irradiation.