فوسفات الزنك

Zinc phosphate

الأسماء
اسم أيوپاك Zinc phosphate
Identifiers
رقم CAS
3D model (JSmol)	Interactive image
ChemSpider	22927 Y
ECHA InfoCard	100.029.040
PubChem CID	24519
رقم RTECS	TD0590000
UNII	1E2MCT2M62 Y
CompTox Dashboard (EPA)	DTXSID3064807
InChI	InChI={{{value}}}
SMILES
الخصائص
الصيغة الجزيئية	}P}}Zn3
كتلة مولية	454.13 g mol-1
المظهر	white solid
الكثافة	3.998 g/cm3
نقطة الانصهار
قابلية الذوبان في الماء	insoluble
القابلية المغناطيسية	−141.0·10−6 cm3/mol
معامل الانكسار (nD)	1.595
البنية
البنية البلورية	monoclinic
الكيمياء الحرارية
الإنتالپية المعيارية للتشكل ΔfHo298	− 2891.2 ± 3.3
المخاطر
NFPA 704 (معيـَّن النار)	0 2 0
نقطة الوميض	Non-flammable
ما لم يُذكر غير ذلك، البيانات المعطاة للمواد في حالاتهم العيارية (عند 25 °س [77 °ف]، 100 kPa).
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مراجع الجدول

فوسفات الزنك Zinc phosphate مركب غير عضوي له الصيغة Zn₃(PO₄)₂)(H₂O)₄. This white powder is widely used as a corrosion resistant coating on metal surfaces either as part of an electroplating process or applied as a primer pigment (see also red lead). It has largely displaced toxic materials based on lead or chromium, and by 2006 it had become the most commonly used corrosion inhibitor. Zinc phosphate coats better on a crystalline structure than bare metal, so a seeding agent is often used as a pre-treatment. One common agent is sodium pyrophosphate.

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 المعادن

Natural forms of zinc phosphate include minerals hopeite and parahopeite. A somewhat similar mineral is natural hydrous zinc phosphate called tarbuttite, Zn₂(PO₄)(OH). Both are known from oxidation zones of Zn ore beds and were formed through oxidation of sphalerite by the presence of phosphate-rich solutions. The anhydrous form has not yet been found naturally.

 طب الأسنان

Zinc phosphate dental cement is one of the oldest and widely used dental cements. It is commonly used for luting permanent metal and zirconium dioxide restorations and as a base for dental restorations. Zinc phosphate cement is used for cementation of inlays, crowns, bridges, and orthodontic appliances and occasionally as a temporary restoration.

It is prepared by mixing zinc oxide and magnesium oxide powders with a liquid consisting principally of phosphoric acid, water, and buffers. It is the standard cement to measure against. It has the longest track record of use in dentistry. It is still commonly used; however, resin-modified glass ionomer cements are more convenient and stronger when used in a dental setting.

 المصادر

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