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Low environmental impact paint pretreatment method as an alternative to conventional phosphating

A phosphate, conversion treatment technology, applied in the direction of metal material coating process, etc., can solve the problem of not mentioning the problem of colorable conversion coating reaction sludge and its volume, and achieves reduction in the number of steps, easy removal, The effect of low environmental impact

Active Publication Date: 2016-11-30
NP COIL DEXTER INDUSTRIES SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0042] Again, no mention is made of the problem of pigmentable conversion coatings, reaction sludge and its volume, or the need for specific inhibitors (vanadium compounds certainly cannot be said to be the same)

Method used

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  • Low environmental impact paint pretreatment method as an alternative to conventional phosphating
  • Low environmental impact paint pretreatment method as an alternative to conventional phosphating
  • Low environmental impact paint pretreatment method as an alternative to conventional phosphating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Example 1 - Alternatives to Zinc Phosphate Method

[0090] skim

[0091]

[0092] Concentration of the product used

[0093] first cleaning

[0094] Continuously updated tap water

[0095] second cleaning

[0096] Continuously updated softened water

[0097] Transformation

[0098] Element

[0099] Use concentration of impregnated products

Embodiment 2- 2

[0100] Example 2 - Alternative to Phosphorus-Phosphorus Degreasing Process Conversion Treatment

[0101]

[0102] The use concentration of spray products

1 to 3%

temperature

30 to 50°C

processing time

120 seconds

pH

4，5

[0103] first cleaning

[0104] Continuously updated tap water

-

temperature

30℃

processing time

30 seconds

spraying pressure

2 bar

[0105] second cleaning

[0106] Continuously updated softened water

Embodiment 3

[0107] Example 3 - Laboratory tests and results

[0108] Laboratory tests were performed to compare the results with those of conventional cycles.

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Abstract

The present invention discloses a method for substituting the zinc phosphating method and the phosphine-based degreasing method, the method comprising: > the zinc phosphating replacement method, a, the step of alkaline degreasing the parts to be phosphated; b, Carry out first cleaning with tap water; c, carry out second cleaning with demineralized water; conversion treatment in a masking agent, reactive sludge thickening system and optional baths of titanium and vanadium compounds; e. final cleaning before processing the part in an oven; > phospho-based degreasing alternatives, a , in a reaction sludge thickening system comprising zirconium salts, phosphates, fluoride complexes, ammonia, at least one corrosion inhibitor, at least one process accelerator, at least one masking agent, at least one surfactant, and optional conversion treatment in baths of titanium compounds and vanadium compounds; b. cleaning with tap water; c. cleaning with demineralized water before treating the part in an oven.

Description

technical field [0001] The present invention relates to a phosphating process suitable for various purposes, such as corrosion protection before oiling or waxing, corrosion protection before painting (motor vehicle bodies, household appliances, etc.) , stress reduction in cold deformation of semi-finished products (stretching of pipes, wires, extrusions, etc.), friction reduction between sliding surfaces (manganese phosphating) and electrical insulation. [0002] Whatever the purpose, the method described above comprises a variety of steps, and the reactions that take place involve two main steps. [0003] The reaction begins with acid attack of iron, which is brought into solution in ionic form by an electrochemical mechanism involving an anodic reaction of iron oxidation and a cathodic reaction of simultaneous molecular hydrogen production. As a result of this erosion, the concentration of hydrogen ions decreases (pH increases) in the diffusion boundary layer (a few microme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/36
Inventor M·达米娅尼C·卡尔达纳
Owner NP COIL DEXTER INDUSTRIES SRL