A solid developing material slurry and method for fast developing of potential stamp marks on metal surfaces

Abstract

This invention relates to the field of applied electrochemistry, and particularly to a solid-state development material slurry and method for rapidly revealing latent stamped lettering on metal surfaces. The solid-state development material slurry comprises, by weight, 1-50 parts of a conductive agent, 1-40 parts of a slow-release agent, 1-20 parts of an oxidant, 1-15 parts of a protective agent, 1-5 parts of a pH adjuster, and 1-50 parts of water. The conductive agent, slow-release agent, oxidant, and protective agent are added to water, and the pH of the solution is adjusted. After mixing by stirring, the solid-state development material slurry is poured into a cylindrical mold for molding. The solid-state development material is then directly applied to the area of ​​the metal surface to be developed until the latent stamped lettering appears. This invention has the advantages of simple operation and readily available reagents, and it achieves rapid development of latent stamped lettering on metal surfaces (such as damaged steel vehicle frame numbers), which is of great significance for solving cases of stolen and smuggled vehicles.

Description

Technical Field

[0001] This invention relates to the field of applied electrochemistry, and in particular to a solid-state development material slurry and method for rapidly developing potential stamped lettering on metal surfaces. Background Technology

[0002] With social progress and technological development, metal products are increasingly widely used in various fields such as industry, agriculture, and people's lives, becoming an indispensable part of our production and daily life. The metal products industry includes the manufacturing of structural metal products, metal tools, containers and metal packaging containers, and stainless steel and similar everyday metal products. In the production process of these metal products, stamping technology is commonly used to imprint lettering and patterns on the metal surface to indicate production numbers, specifications, and brand information. In some criminal cases involving metal products, such as motor vehicle and firearm theft and smuggling, criminals, in order to conceal their crimes and facilitate the sale of stolen goods, will erase or smear these lettering and patterns, making it impossible to identify the information and ownership of the stolen metal products, thus greatly hindering the investigation. Therefore, how to reveal the lettering and patterns that have been filed on the surface of metal products has become a key technical aspect of solving cases, an important task in forensic science, and also involves multiple disciplines such as physics and chemistry.

[0003] There are two main methods for revealing latent stamped lettering on metal surfaces: physical and chemical. Compared to physical methods such as magnetic methods, chemical methods are more widely used. Chemical development is further divided into electrolytic methods and chemical reagent development methods. Electrolytic methods typically use 5wt% hydrochloric acid as the electrolyte and the metal frame as the anode, making the on-site operation relatively cumbersome. Chemical reagent development methods involve applying a chemical developing agent to the damaged metal substrate, where a chemical reaction occurs to reveal the actual lettering.

[0004] Although chemical reagent development is relatively simple, the reagents used also present significant technical challenges: if highly corrosive, they can easily cause excessive corrosion, leading to irreversible damage to the vehicle identification number (VIN), posing a considerable risk to personnel and the vehicle being operated; if less corrosive, the development is often unclear and slow. Furthermore, most are in solution form, making them difficult to operate on-site. Summary of the Invention

[0005] The purpose of this invention is to provide a solid display material slurry and method for rapidly displaying latent stamped lettering on metal surfaces. Based on the principle of slow release, oxidants and other substances are fixed in the solid display material, and the release rate of corrosive reagents is controlled during the display and wiping process. This solves the problems of slow display speed, poor clarity, cumbersome operation, and easy volatilization of acidic electrolytes that exist in existing methods for displaying damaged vehicle frame numbers.

[0006] The above-mentioned objective of this invention is achieved through the following technical solution:

[0007] A solid development material slurry for rapid development of latent stamped lettering on metal surfaces, comprising, by weight:

[0008] Conductive agent 1-50 parts;

[0009] Sustained-release agent 1-40 parts;

[0010] Oxidizing agent 1-20 parts;

[0011] Protectant 1-15 parts;

[0012] pH adjuster 1-5 parts;

[0013] Water 1-50 parts.

[0014] The solid development material slurry for rapid development of potential stamped lettering on metal surfaces has a pH value adjusted to a range of 3 to 7.

[0015] The solid display material slurry for rapid display of latent stamped lettering on metal surfaces uses one or more of the following conductive agents: sodium sulfate, potassium sulfate, lithium sulfate, magnesium sulfate, zinc sulfate, ferrous sulfate, ferric sulfate, and copper sulfate.

[0016] The solid development material slurry for rapid development of potential stamped lettering on metal surfaces contains a slow-release agent that is any one or more of hydroxyethyl cellulose, hydroxymethyl cellulose, polyacrylic acid resin, hydroxypropyl cellulose, hydroxyethyl cellulose acetate, cellulose acetate phthalate, cellulose acetate phthalate, vinyl acetate phthalate, hydroxypropyl methyl cellulose phthalate, and hydroxypropyl methyl cellulose succinate.

[0017] The solid development material slurry for rapid development of latent stamped lettering on metal surfaces uses one or more of the following oxidants: potassium permanganate, potassium dichromate, sodium dichromate, sodium chromate, vanadium pentoxide, vanadium dioxide, vanadium oxysulfate, sodium hypochlorite, hypochlorous acid, potassium hypochlorite, potassium permanganate, potassium manganate, manganese dioxide, chromic acid, chromium trioxide, ammonium persulfate, perchloric acid, and sodium perchlorate.

[0018] The solid development material slurry for rapid development of latent stamped lettering on metal surfaces comprises, as a protective agent, any one or more of the following: oleic acid, triethyl acetylglucosyl citrate, glyceryl triacetate, tributyl acetylglucosyl citrate, diethyl phthalate, tributyl citrate, dibutyl sebacate, dibutyl phthalate, glyceryl stearate, diethyl succinate, polyethylene glycol, and propylene glycol.

[0019] The solid development material slurry for rapid development of latent stamped lettering on metal surfaces uses one or more of the following as pH adjusters: potassium hydroxide, ethylenediamine, sulfuric acid, formic acid, oxalic acid, and citric acid.

[0020] The solid display material slurry for rapid display of potential stamped lettering on metal surfaces is prepared by adding a conductive agent, a slow-release agent, an oxidant, and a protective agent to water and adjusting the pH value of the solution. The solid display material slurry is obtained by stirring and mixing, and the stirring time of the slurry is 1 to 10 hours.

[0021] A method for rapidly revealing latent stamped lettering on a metal surface involves pouring a solid revealing material slurry into a cylindrical mold for molding at a temperature of 20–100°C for 1–10 hours to obtain a solid revealing material; then applying the solid revealing material directly to the area to be revealed on the metal surface until the latent stamped lettering is displayed.

[0022] The method for rapidly revealing latent stamped lettering on metal surfaces involves applying the coating for 2 to 16 minutes until the vehicle frame number is displayed.

[0023] The design concept of this invention is:

[0024] To address the shortcomings of liquid developing agents used in chemical developing methods, this invention introduces a slow-release agent to control the corrosion rate of the oxidant on the metal by preparing a mixed slurry. Furthermore, a solid developing material for revealing potential stamped lettering on the metal surface is prepared using a mold forming method. This effectively solves the problem of excessively strong or weak corrosiveness in chemical developing, achieving rapid, safe, and clear development. The invention involves adding raw materials to water and adjusting the pH of the solution to obtain a slurry. The slurry is then poured into a cylindrical mold to obtain a solid developing material. This solid developing material is directly applied to the area of ​​the metal surface to be developed until the potential stamped lettering appears. The solid developing material includes a conductive agent, a slow-release agent, an oxidant, and a protective agent. The conductive agent enhances the conductivity of the solution, the slow-release agent delays and controls the release of the oxidant, the oxidant corrodes the metal substrate, and the protective agent protects the revealed lettering.

[0025] The advantages and beneficial effects of this invention are:

[0026] This invention, based on the principles of metal chemical corrosion and slow release, addresses the problems of existing methods for revealing damaged vehicle identification numbers (VINs) by controlling the release rate of the oxidizing agent. These problems include easy corrosion, poor clarity, cumbersome operation, and the generation of acid mist. This invention offers advantages such as ease of operation, simple and readily available reagents, and environmental friendliness. It also enables rapid revealing of potentially stamped lettering on metal surfaces (e.g., filed steel VINs), making it significant for solving cases of stolen and smuggled motor vehicles. Attached Figure Description

[0027] Figures 1-3 This describes the effect of revealing potentially stamped lettering on a metal surface. Among other things, Figure 1 A macroscopic image of stamped lettering on a metal surface. Figure 2 To create a macroscopic image of the handwriting after it has been worn down. Figure 3 This is for Embodiment 2 of the present invention. Figure 2 The effect of rubbing or grinding away the lettering. Detailed Implementation

[0028] In practical implementation, this invention proposes a solid display material slurry for rapid display of latent stamped lettering on metal surfaces. The solid display material slurry comprises, by weight, the following:

[0029] Conductive agent 1-50 parts (preferably 2-40 parts);

[0030] Sustained-release agent: 1-40 parts (preferably 2-30 parts);

[0031] Oxidizing agent 1-20 parts (preferably 2-15 parts);

[0032] Protectant 1-15 parts (preferably 1-12 parts);

[0033] pH adjuster 1-5 parts (preferably 1-4 parts);

[0034] 1 to 50 parts water (preferably 5 to 40 parts).

[0035] Take the conductive agent, slow-release agent, oxidant, protective agent, pH adjuster, and water, and add them to the beaker in sequence. Adjust the pH value of the solution and mix them evenly by stirring to obtain a solid display material slurry.

[0036] The technical solution of the present invention will now be clearly and completely described in conjunction with specific embodiments 1 to 5. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] 30 parts sodium sulfate, 15 parts hydroxymethyl cellulose, 10 parts potassium permanganate, 8 parts oleic acid, 3 parts ethylenediamine, and 40 parts water were added sequentially to a beaker and stirred for 1 hour to obtain a solid development material slurry. The solid development material slurry was poured into a cylindrical mold and molded at 25°C for 5 hours to obtain a cylindrical solid development material rod. The solid development material rod was directly rubbed back and forth on the area to be developed on the metal surface for electrolytic development. After 15 minutes, the latent text was developed.

[0039] Example 2

[0040] 25 parts potassium sulfate, 20 parts hydroxypropyl cellulose, 4 parts potassium dichromate, 5 parts triethyl acetylacetic acid, 1 part sulfuric acid, and 30 parts water were added sequentially to a beaker and stirred for 2 hours to obtain a solid development material slurry. The solid development material slurry was poured into a cylindrical mold and molded at 35°C for 4 hours to obtain a cylindrical solid development material rod. The solid development material rod was directly rubbed back and forth on the area to be developed on the metal surface for electrolytic development. After 5 minutes, the latent text was developed.

[0041] Example 3

[0042] 15 parts zinc sulfate, 13 parts hydroxyethyl cellulose acetate, 3 parts vanadium pentoxide, 4 parts dibutyl sebacate, 1.2 parts oxalic acid, and 35 parts water were added sequentially to a beaker and stirred for 3 hours to obtain a solid development material slurry. The solid development material slurry was poured into a cylindrical mold and molded at 70°C for 2 hours to obtain a cylindrical solid development material rod. The solid development material rod was directly rubbed back and forth on the area to be developed on the metal surface for electrolytic development. After 6 minutes, the latent text was developed.

[0043] Example 4

[0044] 18 parts magnesium sulfate, 8 parts cellulose acetate phthalate, 6 parts chromium trioxide, 11 parts polyethylene glycol, 3 parts formic acid, and 20 parts water were added sequentially to a beaker and stirred for 3 hours to obtain a solid development material slurry. The solid development material slurry was poured into a cylindrical mold and molded at 80°C for 1 hour, resulting in a cylindrical solid development material rod. The solid development material rod was directly rubbed back and forth on the area to be developed on the metal surface for electrolytic development. After 10 minutes, the latent text was revealed.

[0045] Example 5

[0046] Eight parts copper sulfate, 14 parts hydroxypropyl methylcellulose phthalate, seven parts sodium hypochlorite, eight parts diethyl succinate, two parts citric acid, and 25 parts water were added sequentially to a beaker and stirred for 5 hours to obtain a solid development material slurry. The solid development material slurry was poured into a cylindrical mold and molded at 60°C for 2 hours to obtain a cylindrical solid development material rod. The solid development material rod was directly rubbed back and forth on the area to be developed on the metal surface for electrolytic development. After 8 minutes, the latent text was developed.

[0047] like Figures 1-3 As shown, the solid display material and method of the present invention can be seen from the effect of revealing the potential stamped lettering on the metal surface. The lettering is revealed quickly and clearly, which is suitable for on-site operation and has promotional value.

[0048] Experimental results show that the present invention is simple to operate, uses simple reagents, and significantly improves the development rate and efficiency, which is of great significance for solving cases of stolen and smuggled vehicles.

Claims

1. A solid-state development material slurry for rapid development of latent stamped lettering on metal surfaces, characterized in that, By weight, the solid display material slurry comprises: Conductive agent 1-50 parts; Sustained-release agent 1-40 parts; Oxidizing agent 1-20 parts; Protectant 1-15 parts; pH adjuster 1-5 parts; 1-50 parts water; The conductive agent is one or more of sodium sulfate, potassium sulfate, lithium sulfate, magnesium sulfate, zinc sulfate, ferrous sulfate, ferric sulfate, and copper sulfate. The sustained-release agent is any one or more of hydroxyethyl cellulose, hydroxymethyl cellulose, polyacrylic acid resin, hydroxypropyl cellulose, hydroxyethyl cellulose acetate, cellulose acetate phthalate, cellulose acetate phthalate, vinyl acetate phthalate, hydroxypropyl methyl cellulose phthalate, and hydroxypropyl methyl cellulose succinate. The oxidizing agent is one or more of the following: potassium permanganate, potassium dichromate, sodium dichromate, sodium chromate, vanadium pentoxide, vanadium dioxide, vanadium oxysulfate, sodium hypochlorite, hypochlorous acid, potassium hypochlorite, potassium permanganate, potassium manganate, manganese dioxide, chromic acid, chromium trioxide, ammonium persulfate, perchloric acid, and sodium perchlorate. The protective agent is any one or more of oleic acid, triethyl acetylglucosyl citrate, glyceryl triacetate, tributyl acetylglucosyl citrate, diethyl phthalate, tributyl citrate, dibutyl sebacate, dibutyl phthalate, glyceryl stearate, diethyl succinate, polyethylene glycol, and propylene glycol.

2. The solid development material slurry for rapid development of latent stamped lettering on metal surfaces according to claim 1, characterized in that, The pH value of the slurry should be adjusted to a range of 3 to 7.

3. The solid development material slurry for rapid development of latent stamped lettering on metal surfaces according to claim 1, characterized in that, The pH adjuster is one or more of the following: potassium hydroxide, ethylenediamine, sulfuric acid, formic acid, oxalic acid, and citric acid.

4. The solid development material slurry for rapid development of latent stamped lettering on metal surfaces according to claim 1, characterized in that, The conductive agent, slow-release agent, oxidant, and protective agent are added to water and the pH value of the solution is adjusted. The solid display material slurry is obtained by stirring and mixing. The stirring time of the slurry is 1 to 10 hours.

5. A method for rapidly developing latent stamped lettering on a metal surface using a solid development material slurry according to any one of claims 1 to 4, characterized in that, Solid display material slurry is poured into a cylindrical mold for molding. The molding temperature is 20-100℃ and the molding time is 1-10 hours to obtain solid display material. The solid display material is then directly applied to the area to be displayed on the metal surface until the potential stamped lettering is displayed.

6. The method for rapidly revealing latent stamped lettering on a metal surface according to claim 5, characterized in that, When rapidly revealing the potential stamped lettering on the chassis surface, the wiping time is 2 to 16 minutes until the chassis number is displayed.

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