Phosphating
TECHNICOAT s.r.o. is a provider of manganese phosphate application. Using modern technologies, Technicoat aims to meet customers´ needs for metal finishing solutions.
Our processing facility is certified to EN 124 76 (e.g. Fe / Mnph / r / 3 / T1 / T2)
Manganese phosphate structure: fine to semi-granular manganese phosphate.
Maximum dimensions of a part to be manganese phosphated are 1.5 x 1.5 x 1.7 m (width/width/height) and the maximum weight should not exceed 5000 kg.
Manganese phosphating process includes the following phases:
- Degreasing
- Grit-blasting as preliminary treatment - optional
- Activation
- Phosphating
- Water rinse - 2-phase water rinse in 2 bathes
- Passivation – optional
- Water rinse
- Drying
TECHNICOAT s.r.o. runs two independent semi-automatic manganese phosphating lines:
Line 1
Activation process followed by manganese phosphating in a bath, two – phase water rinsing process, passivation process and final water rinse and drying.
Line 2
Degreasing bath followed by 2 – phase water rinsing process, activation, manganese phosphating process, water rinse and automatic drying.
Applied manganese phosphate coating weight options:
- 3-10 gr/m2
- 10-30 g/m2
The actual weight of a manganese phosphate layer depends on the following:
- Surface preparation process of a part to be manganese phosphated
- Whether the surface was grit-blasted prior to a manganese phosphate application
- Manganese phosphate bath temperature
- Whether the activation bath was used and if, the type of a bath
- Type of material to be manganese phosphated
References:
Corrosion protection of materials
- Machinery parts for offshore industry (offshore oil extraction)
- Parts for nuclear engineering technologies including metal-preserving lubricant treatment, which is required for parts transportation
Pre-treatment method prior to fluoropolymer coatings application (TEFLON®, XYLAN®, HALAR®) and PA-11 (RILSAN®) to ensure required adhesion properties of applied coating to a substrate:
- Machinery parts for offshore industry (offshore oil extraction)
- Parts for nuclear engineering technologies
- Parts for automotive industry
Pricing of manganese phosphate application is based on the following:
- Part size and weight
- Total quantities per order
- Required weight of applied manganese phosphate layer
TECHNICOAT´S surface treatment specialists look forward to your price enquiries. Please contact as at Email:......or fill in the enquiry from at http://www.technicoat.cz/en/poptavka/212/enquiry-form.html.
Phosphating general info
Phosphate coating process
Phosphating (or phosphatizing) is a chemical process of phosphate coating application to clean surface of metal, most frequently to steel.
The main types of phosphate coatings are manganese, iron and zinc. A dilute solution of phosphoric acid and phosphate salts is applied and chemically reacts with the surface of the part being coated to form a layer of insoluble, crystalline phosphates.
Phosphate coatings perform a function of electrical insulator and therefore they minimize the corrosion current. They are insolvable in water or in any known organic solution. They show great adhesion properties to metal substrates.
Crystalline phosphate coatings have the following functions:
Corrosion protection of metal parts
Improve the adhesion of a lubricant and reduce friction during metal parts cold forging processes e.g. metal pipes stretch forming.
Pre-treatment for paint application processes to improve adhesion of paint to metal substrates.
Prevent under-film corrosion that sometimes occurs at the interface of paints and substrates.
Minimise friction of steel non-stationary machinery parts under equipment start-up process
Excellent electrical insulator
Phosphating - ideal corrosion protection
Phosphating together with impregnation is a traditional corrosion protection method applied within mass production of machinery parts.
Crystalline properties of phosphate coatings maximize the adhesion of impregnating agent to substrates.
The thicker the phosphate coating, the higher adhesion is. The final treatment involves the impregnation of phosphate coating with oil, Vaseline or wax.
Phosphating prior to metal cold forging
Within the process of metal cold forging, phosphate coatings together with lubricants function as an intermediate film, which minimizes the friction between forming tool and a processed part. To obtain phosphate coating with required dry lubrication properties, the phosphated parts are dipped into hot sodium stearate (soap) solution. Crystalline phosphate coating absorbs soap and reacts meanwhile forming insolvable zinc soap.
Phosphating: Surface pre-treatment prior to coat/paint application
Increased corrosion resistance of coated surfaces is ensured by the application of phosphate coating prior to the coat/paint application. Phosphate coating prevents the occurrence of corrosion under the applied coat/paint and increases the coat/paint adhesion to metal substrates.
To obtain the highest corrosion resistance, the most effective appears to be the application of phosphate coating at very high thickness. Unfortunately thicker layers of phosphate coatings tend to let go individual crystals, which leads to very low tear resistance properties of applied coats/paints. Therefore the minimum thickness of phosphate coating should be applied.
Phosphating of non-stationary parts prior to start-up process
This technology was developed for non-stationary machinery parts to facilitate for easy and smooth start-up processes. Phosphating agent used for this particular application comprises predominantly of manganese. Manganese phosphate coating applied to steel substrate compared to standard zinc phosphate coating shows improved hardness and due to a different crystalline structure also enhanced oil absorption properties. Manganese phosphate coatings increase machinery parts wear resistance and reduce machinery and equipment noise.