SNZNSilent Night, Zombie Night (movie)
SNZNTin Zinc
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Two basic categories of particle type classes were operationally defined: "heavy metal" and "other inorganic." The former consisted of those classified as Pb type ([+ or -] Ca, and/or P), Sn type (containing predominantly Sn), Zn type (composed almost exclusively of Zn), SnZn type, Sb-containing type, SbPb type, and "other metal" particles (Cu-, Ni-, Cd-, or Mn-containing).
Solder Categories per IPC-1066 e1 SnAgCu e2 Other tin alloys (e.g., SnCu, SnAg, SnAg, CuX, etc.) e3 Tin e4 Precious metals (e.g., Ag, Au, NiPd, NiPdAu, but no tin) e5 SnZn, SnZnX (no bismuth) e6 Contains bismuth e7 Low-temperature solder (<150[degrees]C) containing indium but no bismuth e8,e9 Symbols are unassigned categories at this time
Pb-Free Solder Paste Comparisons Alloy Preference Liquidus Temp Disadvantages SnAgCu Most suitable 217 to 220[degrees]C Higher melting point SnZn Attractive 199[degrees]C Short shelf-life SnBi Attractive 138[degrees]C Brittle and sensitive to Pb contamination
Abstract: A copper substrate was coated with SnZn lead-free solder (SnZn9 and SnZn8Bi3), and the following corrosion tests were performed: salt mist, gas corrosion and weathering.
Tin-zinc (SnZn) and tin-zinc-bismuth (SnZnBi) are still outsiders for reflow soldering for the foreseeable future.