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Solderability
The solderability of a substrate is a measure of the ease with which a soldered joint can be made to that material. Good solderability requires wetting (low contact angle) of the substrate by the solder.〔(Solders, fluxes, and solderability ) Section 5: Solderability , ''www.tutorialsweb.com''〕
==Solderability of metals==
Solderability varies depending on the type of solder alloy under discussion. The discussion that follows applies only to unspecified electronic solders 〔 (which may include solders that contain Lead, now banned for use in nearly all electronic equipment made or sold in the EU). Solderability when using lead-free alloys can differ significantly from solderability when using lead based alloys.
Noble metals may be easy to solder but they have brittle joints. The metals in the good category require a large amount of heat therefore oxidation is an issue. To overcome this a flux is required. For carbon steel, low alloy steel, zinc, and nickel the presence of sulfur creates a brittle joint; lower temperatures are used to minimize this problem. The oxides on the surface of aluminium cause wetting issues and special solders must be used to prevent galvanic corrosion issues. Stainless steel and high alloy steel have a low solderability because the chromium alloying element creates oxides that require aggressive fluxes. The only way that the final category of metals can be soldered is by pre-plating them in a metal that is solderable.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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