Solderability study of 63Sn-37Pb on zinc-plated and cadmium-plated stainless steel for the MC4636 lightning arrestor connector.

Lopez, Edwin Paul ; Vianco, Paul Thomas ; Rejent, Jerome Andrew ; Martin, Joseph J.

Sandia National Laboratories

关键词: Corrosion Protection;    36 Materials Science;    Lightning;    Plating;    Weapon 76;   

DOI  :  10.2172/975253
RP-ID  :  SAND2004-3114
RP-ID  :  AC04-94AL85000
RP-ID  :  975253

美国|英语

来源: UNT Digital Library

【 摘 要 】

Cadmium plating on metal surfaces is commonly used for corrosion protection and to achieve good solderability on the 304L stainless steel shell of the MC4636 lightning arrestor connector (LAC) for the W76-1 system. This study examined the use of zinc as a potential substitute for the cadmium protective surface finish. Tests were performed with an R and RMA flux and test temperatures of 230 C, 245 C, and 260 C. Contact angle, {theta}{sub c}, served as the generalized solderability metric. The wetting rate and wetting time parameters were also collected. The solderability ({theta}{sub c}) of the Erie Plating Cd/Ni coatings was better than that of similar Amphenol coatings. Although the {theta}{sub c} data indicated that both Cd/Ni platings would provide adequate solderability, the wetting rate and wetting time data showed the Amphenol coatings to have better performance. The Zn/Ni coatings exhibited non-wetting under all flux and temperature conditions. Based on the results of these tests, it has been demonstrated that zinc plating is not a viable alternate to cadmium plating for the LAC connectors.