{"id":84262,"date":"2024-10-18T03:35:24","date_gmt":"2024-10-18T03:35:24","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-b984-2012\/"},"modified":"2024-10-24T19:59:36","modified_gmt":"2024-10-24T19:59:36","slug":"astm-b984-2012","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-b984-2012\/","title":{"rendered":"ASTM-B984 2012"},"content":{"rendered":"

ASTM B984-12<\/h3>\n

Historical Standard: Standard Specification for Electrodeposited Coatings of Palladium- Cobalt Alloy for Engineering Use<\/h4>\n
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ASTM B984<\/h4>\n

Scope<\/strong><\/p>\n

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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.<\/p>\n<\/p><\/div>\n

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1.2 Properties<\/span>\u2014Palladium is the lightest and least noble of the platinum group metals (1)2<\/sup><\/span>. 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<\/sup><\/span>. Palladium-cobalt has smaller grain size (ASTM E112), 50 \u2013 150 Angstroms, compared to Hard Gold 200 \u2013 250 Angstroms (1)2<\/sup><\/span>. 5 \u2013 15 nanometer, compared to hard gold 20 \u2013 25 nanometer (1)2<\/sup><\/span>. Palladium-cobalt has low porosity (ASTM B799) 0.2 porosity index compared to hard gold 3.7 porosity index (1)2<\/sup><\/span>. 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\u00b0C than hard gold 150\u00b0C, and silver 170\u00b0C. The following Table 1 compares the hardness range of electrodeposited palladium-cobalt with other electrodeposited noble metals and alloys (3,4).2<\/sup><\/span><\/p>\n<\/p><\/div>\n

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\n TABLE 1 – Hardness of Noble Metals<\/b>\n <\/div>\n<\/p><\/div>\n
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1.3 Units\u2014<\/i>The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.<\/p>\n<\/p><\/div>\n

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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.<\/i><\/p>\n<\/p><\/div>\n

Keywords<\/strong><\/p>\n

connectors; contacts; electrical connectors; electrical contacts; engineering coatings; palladium; palladium-cobalt coatings; palladium-cobalt electrodeposits; palladium-cobalt plating<\/p>\n

ICS Code<\/strong><\/p>\n

ICS Number Code 25.220.40 (Metallic coatings)<\/p>\n

DOI:<\/strong> 10.1520\/B0984-12<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

B984-12 Standard Specification for Electrodeposited Coatings of Palladium- Cobalt Alloy for Engineering Use<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2012<\/td>\n7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":84263,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[442,2637],"product_tag":[],"class_list":{"0":"post-84262","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-25-220-40","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/84262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/84263"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=84262"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=84262"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=84262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}