クロム酸ストロンチウム 化学特性,用途語,生産方法
用途
ストロンチウムクロメート, SrCrO4の組成で、古くからシトロンエローの名で絵の具として使われてきたが、近年水溶性樹脂の開発に伴い、さび止め顔料として脚光を溶びるようになった。硝酸ストロンチウム（Ⅱ）Sr(NO3)2とクロム酸ナトリウムNa2CrO4の各水溶液を反応させて得られるが、生成物の一つである硝酸ナトリウムNaNO3が混入すると、さび止め効果のない可溶性の成分が増えることになり、塗膜に悪影響を与える。貯蔵中変質せず、耐熱性はジンククロメートよりもよい。溶解度はZPC（塩基性クロム酸亜鉛カリウム）型ジンククロメートの約2分の1（4～7％）、CrO42-の溶出量はやや少ないが、長期にわたり持続する。同じ系のバリウムクロメートも絵の具のほかさび止め顔料に用いられている。［大塚 淳］ 
"ストロンチウムクロメートの分光反射率曲…
小学館 日本大百科全書(ニッポニカ) ）
用途
顔料、染料、塗料
化学的特性
Strontium chromate a light yellow crystalline solid or powder.
Strontium chromate is prepared by precipitating a suitably soluble chromate with an appropriate strontium salt. Finding a primary use in corrosion-inhibiting coatings, this pigment has poor tint strength, low opacity, and unsatisfactory alkali and acid resistance, which limits its more widespread use in the coatings industry. Little of this pigment is now manu- factured in the United States.
使用
Strontium chromate is mainly used to prevent corrosion on aluminum, and primers containing this pigment are standard for the aviation industry. Strontium chromate is so effective at low loadings that it is often used to provide inhibition for coil coatings despite the fact that it is the most expensive chromate inhibitor. The pigment is sometimes combined with zinc chromate in water-based formulations. In these cases, to avoid stability problems, loadings are kept at low levels, about 2% total chromate.
Corrosion inhibitor in pigments; in electrochemical processes to control sulfate concentration of solutions.
一般的な説明
STRONTIUM CHROMATE is a light yellow powder or granular solid. STRONTIUM CHROMATE is insoluble in water. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. STRONTIUM CHROMATE is used as a pigment, a protective coating against corrosion, and in pyrotechnics.
空気と水の反応
STRONTIUM CHROMATE is insoluble in water. Reactivity in Water: Produces hazardous solution.
反応プロフィール
Oxidizing agents, such as STRONTIUM CHROMATE, can react with reducing agents to generate heat and products that may be gaseous (causing pressurization of closed containers). The products may themselves be capable of further reactions (such as combustion in the air). The chemical reduction of materials in this group can be rapid or even explosive, but often requires initiation (heat, spark, catalyst, addition of a solvent). Explosive mixtures of inorganic oxidizing agents with reducing agents often persist unchanged for long periods if initiation is prevented. Such systems are typically mixtures of solids, but may involve any combination of physical states. Some inorganic oxidizing agents are salts of metals that are soluble in water; dissolution dilutes but does not nullify the oxidizing power of such materials. Organic compounds, in general, have some reducing power and can in principle react with compounds in this class. Actual reactivity varies greatly with the identity of the organic compound. Inorganic oxidizing agents can react violently with active metals, cyanides, esters, and thiocyanates. Avoid contact with water, acids, and bases.
危険性
Toxic by ingestion. Confirmed carcinogen.
健康ハザード
INHALATION: Irritating to mucous membranes. SKIN: Repeated skin contact can cause eczematous dermatitis, with edema and ulceration. INGESTION: Dizziness, intense thirst, abdominal pain, vomiting, shock and oliguria or anuria.
火災危険
Behavior in Fire: Heat stable
安全性プロファイル
Confirmed human carcinogen with experimental carcinogenic and tumorigenic data. Moderately toxic by ingestion. Mutation data reported. See also CHROMIUM COMPOUNDS and STRONTIUM COMPOUNDS.
職業ばく露
Strontium chromate is used as a metal protective coating to prevent corrosion, in wash primers; and aluminum flake coatings; colorant in polyvinyl chloride resins and pyrotechnics.
輸送方法
UN3086 Toxic solids, oxidizing, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, 5.1-Oxidizer. Technical Name Required.
純化方法
Crystallise strontium chromate from water (40mL/g) by cooling.
不和合性
Violent reaction with strong oxidizers, hydrazine. Incompatible with combustible, organic, or other readily oxidizable materials, such as paper, wood, sulfur, aluminum powder. Attacks plastics and coatings
クロム酸ストロンチウム 上流と下流の製品情報
原材料
準備製品