Single-Stage Metal Pickling and Phosphating Device
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Solution Overview
Problem
Existing phosphating systems require multiple steps, extensive use of toxic and environmentally harmful chemicals, and frequent bath changes, leading to high operational costs, space requirements, and risks to personnel and the environment, while also being inefficient in preventing hydrogen embrittlement in metal treatments.
Innovation Solution
A one-step treatment device using a phosphorus or phosphate-containing solution with inhibitors, circulated by a pump and enhanced by a turbulence device to prevent impurities from settling, reducing the need for frequent chemical changes and minimizing the use of toxic substances, and creating a protective layer that prevents hydrogen embrittlement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate baths are used for degreasing, rinsing, pickling, and phosphating, then each treatment step can be optimized independently, but the system requires extensive space, large quantities of different chemicals, and frequent bath changes
Solution Approach 1:
The patent combines multiple separate treatment baths (degreasing, rinsing, pickling, phosphating) into a single integrated treatment bath containing a multifunctional composition. This composition includes chelating agents for degreasing, buffers for pH control, phosphating agents for phosphate layer formation, and inhibitors for hydrogen embrittlement prevention, all working simultaneously in one bath to treat metal substrates through multiple stages.
Solution Approach 2:
The treatment composition is designed as a universal solution that performs multiple functions: it acts as a degreaser through chelating agents, a pickling agent through mild acids, a phosphating agent through phosphate compounds, and a passivation agent through inhibitors. This multi-functional approach eliminates the need for separate specialized baths for each treatment step.
2Manufacturing precision
If conventional pickling acids (hydrochloric acid, sulfuric acid) are used, then effective pickling is achieved, but toxic and environmentally harmful effects increase, requiring expensive safety measures
Solution Approach 1:
The patent changes the chemical parameters of the pickling agent by replacing strong mineral acids (hydrochloric acid, sulfuric acid) with milder organic acids such as acetic acid, citric acid, or oxalic acid. This parameter change maintains adequate pickling effectiveness while dramatically reducing toxicity, environmental harm, and the need for expensive safety infrastructure.
Solution Approach 2:
The treatment composition is designed to be relatively inexpensive and can be replenished or replaced more frequently rather than requiring expensive safety infrastructure. The use of biodegradable organic acids and chelating agents makes the composition more environmentally friendly and less costly to dispose of compared to conventional strong acid systems.
3Manufacturing precision
If objects are conveyed between multiple baths, then each treatment step is completed, but treatment time increases due to transport time and handling
Solution Approach 1:
The patent merges multiple sequential treatment steps into a single simultaneous process occurring in one bath. The object remains stationary in the treatment bath while all treatment functions (degreasing, pickling, phosphating, passivation) occur concurrently, eliminating the time required for conveying the object between separate baths and performing multiple immersion steps.
4Reliability
If hydrogen embrittlement prevention is prioritized, then material integrity is maintained, but treatment process complexity increases
Solution Approach 1:
The patent introduces inhibitors as intermediary substances in the treatment composition that mediate between the pickling process and the metal substrate. These inhibitors form protective films on the metal surface that prevent hydrogen atoms generated during pickling from penetrating into the metal lattice, thereby preventing hydrogen embrittlement without requiring separate post-treatment steps or complex process controls.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a more efficient, safer, and cost-effective metal treatment process with improved surface quality, reduced chemical consumption, and extended protection against oxidation and hydrogen embrittlement, allowing treated objects to be exposed to air for longer without rusting.
Implementation Method 1
a pump device for exchanging at least a portion of the treatment substance, with the treatment substance flowing around at least part of the treatment object
Implementation Method 2
the treatment comprises at least the pickling and the phosphating of the treatment item
Implementation Method 3
creating a protective layer that prevents hydrogen embrittlement
Implementation Method 4
enhanced by a turbulence device to prevent impurities from settling
Data Source
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AI summary
The invention relates to a treatment device (1) for the single-stage treatment of a metal object (2) to be treated, wherein the treatment comprises at least the pickling and the phosphating of the object (2) to be treated, wherein the treatment device (1) comprises at least the following apparatuses: a treatment container (4) for holding the object (2) to be treated and for holding a flowable treatment substance (6), a pumping apparatus (10) for circulating at least a portion of the treatment substance (6), wherein the treatment substance (6) flows around at least part of the object (2) to be treated, in particular the entire object (2) to be treated, wherein the treatment substance (6) is a phosphorus- or phosphate-containing solution, in particular phosphoric acid, wherein the phosphorus- or phosphate-containing solution consists of water, in particular deionized water, and of a reaction substance, and the reaction substance consists of phosphorus or of a phosphate and of at least one additional substance that improves the treatment effect, in particular one or more inhibitors, wherein the fraction of the phosphorus or the phosphate in the reaction substance is between 75 vol% and 94 vol% and preferably between 80 vol% and 90 vol% and especially preferably between 83 vol% and 88 vol%, wherein the reaction substance has no fractions of hydrochloric acid and sulfuric acid and preferably also no fractions of fluorine, chlorine, bromine, iodine, lead, mercury, and selenium and wherein the reaction substance is mixed with water at a specified ratio, wherein the specified ratio lies between a lower limit and an upper limit, wherein the lower limit is defined by a mixture at a ratio of 1 kg of reaction substance to 4 liters of water and the upper limit is defined by a mixture of 1 kg of reaction substance to 12 liters of water, and in particular the mixture has a ratio of 1 kg of reaction substance to 6 liters of water.