摘要:
Corrosion inhibitors containing a mixture of one or more water soluble tetraborate salts and one or more water soluble condensed phosphate salts are non-toxic and are more effective than either of the components alone. These compositions containing both tetraborates and condensed phosphates are also more effective than such prior art inhibitors as nitrites and ethanolamine-based inhibitors.
摘要:
A method for activating a metal surface during a phosphating process by treating the surface with an activating solution containing titanium ions, phosphate ions, and borate ions, after initial cleaning and rinsing but before phosphation.
摘要:
The invention relates to a process for phosphatizing metal surfaces with an acidic phosphatizing solution containing zinc ions, calcium ions, phosphate ions and accelerators and, optionally, other additives, characterized in that, after degreasing and without activation, the metal surfaces are brought into contact at 30.degree. to 65.degree. C. with solutions which contain Zn.sup.2+, Ca.sup.2+, PO.sub.4.sup.3- and, as accelerators, nitrate and/or nitrite and/or chlorate ions and/or an organic nitro compound and/or H.sub.2 O.sub.2 or an inorganic peroxide and which have a pH-value of from 2.2 to 3.8, a ratio of free acid to toal acid of from 1:10 to 1:60 and a ratio by weight of (Ca.sup.2+ +Zn.sup.2+) to PO.sub.4.sup.3- of from 1:>8 to 1:40, and to the use of this process for pretreating the metal surfaces for painting by electrodeposition, particularly by cathodic electrodeposition.
摘要:
The present invention relates to a process for phosphating metal surfaces, and more specifically of surfaces of iron, zinc, and aluminum and the alloys thereof as a pretreatment for cold working wherein the surfaces without previous activation are contacted in a temperature range of from 30.degree. C. to 70.degree. C. with an aqueous solution containing(a) from 10 to 40 g/l of Ca.sup.2+ ions,(b) from 10 to 40 g/l of Zn.sup.2+ ions,(c) from 10 to 100 g/l of OP.sub.4.sup.3- ionsand, as accelerator,(d) from 10 to 100 g/l of NO.sub.3.sup.- ions and/or(e) from 0.1 to 2.0 g/l of organic nitro compounds,said solution exhibiting a pH value in the range of from 2.0 to 3.8 and a ratio of free acid to total acid of from 1:4 to 1:100.
摘要翻译:本发明涉及一种用于将金属表面磷酸化的方法,更具体地说是将铁,锌和铝的表面以及它们的合金作为冷加工的预处理方法,其中没有先前活化的表面在30℃的温度范围内接触 (a)10-40g / l Ca2 +离子的水溶液,(b)10-40g / l Zn2 +离子,(c)10-100g / l 的OP43-离子,并且作为促进剂,(d)10至100g / l的NO 3 - 离子和/或(e)0.1至2.0g / l的有机硝基化合物,所述溶液的pH值在该范围内 为2.0至3.8,游离酸与总酸的比例为1:4至1:100。
摘要:
A process for phosphating metal surfaces, particularly iron, steel and zinc-plated steel, by treating them with aqueous, acidic zinc phosphate baths at only moderately elevated temperatures in the range of from 22.degree. to 38.degree. C. The baths used have 2 to 6 g/l of Zn; 4 to 23 g/l of PO.sub.4.sup.3- ; a free acid content of 0.05 to 0.4 points; and a pH-value of 3.0 to 4.0. The ratio of Zn to PO.sub.4.sup.3- is preferably in the range from 1:2 to 1:11. The baths can advantageously contain nickel-(II)-ions, with a nickel content not exceeding a Zn:Ni ratio of 1:0.5. This process gives iron-containing zinc phosphate layers having an iron content of from 5 to 20% by weight and is particularly useful for pretreatment for subsequent cathodic electro-dip-lacquering.
摘要翻译:通过在22℃至38℃的适度升高的温度下用含水的酸性磷酸锌浴处理金属表面,特别是铁,钢和镀锌钢的方法,所用的浴具有2至 6g / l Zn; 4〜23g / l PO43-; 游离酸含量为0.05〜0.4分; pH值为3.0〜4.0。 Zn与PO43-的比优选在1:2至1:11的范围内。 该浴可以有利地包含镍 - (II),其镍含量不超过Zn:Ni比为1:0.5。 该方法产生铁含量为5至20重量%的含铁磷酸锌层,并且对于随后的阴极电镀漆的预处理特别有用。
摘要:
An improved friction-welding process for effecting a joint between steel and nodular graphite-containing cast iron by using (i) a short friction-generating time so as to minimize diffusion of carbon into steel and (ii) an elevated forging pressure so as to effect a quantitative ejection of carburized melt but avoid formation of a weld laminate, is provided, as well as a nodular graphite-containing cast iron of grade 40.3 S, suitable for use in friction-welding and comprising about 280-320 graphite nodules per mm.sup.2, 280-300 ferrite grains per mm.sup.2 and a spherulite proportion of about at least 95% by weight of the graphite precipitations.
摘要翻译:一种改进的摩擦焊接方法,用于通过使用(i)短的摩擦产生时间来实现钢和含节结构的含石墨的铸铁之间的接合,以使碳的扩散最小化到钢中,和(ii)升高的锻造压力,以便 实现渗碳熔体的定量喷射,但避免形成焊接层压板,以及适用于摩擦焊接的含有40.3 S的球墨铸铁,其包含约280-320个石墨结核/ mm2 ,280-300铁素体颗粒/ mm 2,球晶比例约为石墨沉淀物重量的至少95%。
摘要:
A composition for the after-passivation of phosphated metal surfaces and a method for its use, the composition containing at least one water soluble salt of tetravalent titanium or divalent manganese, cobalt, nickel or copper.