1.1本规范涵盖了含约80%钯和20%钴的电沉积钯-钴合金涂层的要求。还涵盖了由钯钴和薄镀金组成的复合涂层，用于涉及电触点的应用。钯和钯钴在高可靠性应用中仍然具有竞争力。 1.2 属性 -钯是铂族金属中最轻、最不贵的一种( 1. ) 2. . IIt的密度为12克/立方厘米，比重为12.0，这大大低于黄金的密度，19.29克/立方厘米，比重为19.3，铂的密度为21.48克/立方厘米，比重为21.5。另一方面，钴的密度甚至低于钯。它只有8.69克每立方厘米，比重8.7。这产生了更大的涂层体积或厚度，从而节省了一些金属重量并降低了成本。 钯钴涂层表面提供坚硬的表面光洁度（ASTM E18 )从而减少磨损，提高耐久性。与硬金0.60相比，镀钯钴的表面也具有非常低的摩擦系数0.43，从而为电触点提供较低的配合力和非配合力( 1. ) 2. . 钯钴的晶粒尺寸较小（ASTM E112 )，50-150埃，而硬金为200-250埃( 1. ) 2. . 5-15纳米，而硬金为20-25纳米( 1. ) 2. . 钯钴具有低孔隙率（ASTM B799 )0.2孔隙度指数与硬金相比3.7孔隙度指数( 1. ) 2. . 钯钴涂层表面具有更高的延展性（ASTM B489页 )3-7比硬金<3（1）2。钯钴涂层表面在395°C下的热稳定性也高于150°C的硬金和170°C的银。下表1比较了电沉积钯的硬度范围- 钴与其他电沉积贵金属和合金( 3. , 4. ). 2. 表1-贵金属硬度 近似硬度（HK 25 ) 金 50–250 钯 75–600 铂金 150–550 钯镍 300–650 钯钴 500–650 铑 750–1100 钌 600–1300 1.3 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。第7节“危险”中给出了一些具体的危险说明。

1.1 This specification covers requirements for electrodeposited palladium-cobalt alloy coatings containing approximately 80% of palladium and 20% of cobalt. Composite coatings consisting of palladium-cobalt with a thin gold overplate for applications involving electrical contacts are also covered. Palladium and palladium-cobalt remain competitive finishes for high reliability applications. 1.2 Properties —Palladium is the lightest and least noble of the platinum group metals ( 1 ) 2 . IIt has the density of 12 gm per cubic centimeter, specific gravity of 12.0, that is substantially lower than the density of gold, 19.29 gm per cubic centimeter, specific gravity 19.3, and platinum 21.48 gm per cubic centimeter, specific gravity 21.5. The density of cobalt on the other hand is even less than palladium. It is only 8.69 gm per cubic centimeter, specific gravity 8.7. This yields a greater volume or thickness of coating and, consequently, some saving of metal weight and reduced cost. Palladium-cobalt coated surface provides a hard surface finish (ASTM E18 ) thus decreasing wear and increasing durability. Palladium-cobalt coated surface also has very low coefficient of friction 0.43 compared to hard gold 0.60 thus providing lower mating and unmating forces for electrical contacts ( 1 ) 2 . Palladium-cobalt has smaller grain size (ASTM E112 ), 50 – 150 Angstroms, compared to Hard Gold 200 – 250 Angstroms ( 1 ) 2 . 5 – 15 nanometer, compared to hard gold 20 – 25 nanometer ( 1 ) 2 . Palladium-cobalt has low porosity (ASTM B799 ) 0.2 porosity index compared to hard gold 3.7 porosity index ( 1 ) 2 . Palladium-cobalt coated surface has higher ductility (ASTM B489 ) 3-7 than that of hard gold <3 (1)2. The palladium-cobalt coated surface is also thermally more stable 395°C than hard gold 150°C, and silver 170°C. The following Table 1 compares the hardness range of electrodeposited palladium-cobalt with other electrodeposited noble metals and alloys ( 3 , 4 ). 2 TABLE 1 - Hardness of Noble Metals Approximate Hardness (HK 25 ) Gold 50–250 Palladium 75–600 Platinum 150–550 Palladium-Nickel 300–650 Palladium-Cobalt 500–650 Rhodium 750–1100 Ruthenium 600–1300 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Some specific hazards statements are given in Section 7 on Hazards.