JPH02243785A - Protection - Google Patents

Abstract

PURPOSE: To temporarily protect the surface of a metal in contact with the corrosive atmosphere from corrosion by dipping the metal surface in a nonpoisonous org. medium contg. a compd. shown by a specified formula and then removing the metal surface from the medium.

CONSTITUTION: The surface of a metal to be protected is dipped in a nonpoisonous org. medium contg. at least one kind of compd. shown by formula I, and then the metal surface is brought out from the medium. In formula I, R is a 12-20C straight-chain or branched alkyl or a group shown by formula II. In formula II, R^a is a 8-15C straight-chain or branched alkyl and arranged at position 3 or 4 of phenyl. The org. solvent to be used is the one with mineral oil, aromatic or aliphatic hydrocarbons, etc., as the base. The compd. of formula I is incorporated by 2-15wt.% into the solvent, and a rust inhibitor, dispersant and surfactant can be incorporated into the solvent. Consequently, the metal surface is temporarily protected easily and effectively.

COPYRIGHT: (C)1990,JPO

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to temporary protection of metal surfaces.

[Prior Art and Problems to be Solved by the Invention] Addition of jetanolamines with etheric olefin oxides or glycidyl ethers as a durable oxidation or corrosion inhibitor for ferrous metals in various substrates. The use of objects is known.

For example, U.S. Pat. No. 2,856,363 describes the formula as an antioxidant for lubricating oils:
The use of compounds in which R2 is a hydrogen atom or an alkyl group having 2 to 12 carbon atoms, R8 is a hydrocarbon chain having 2 to 5 carbon atoms, and Y is a hydrogen atom or R, -OH is described. There is.

British Patent Specification No. 1455476 describes mineral oil as an alkyl group having 2 to 5 carbon atoms substituted with 3 hydroxyl groups; provided that at least one of R7 and RIl is substituted with a hydroxyl group, and Disclosed is a non-aqueous functional liquid containing at least one compound having the following condition: when 10-, R6 represents a branched alkyl group having 4 to 20 carbon atoms.

European Patent No. 252007 discloses corrosion inhibitors of the formula: represents a hydrogen atom, a 2-hydroxyethyl group or a 2-hydroxypropyl group; however, a) 'R, □ and R13 do not represent a hydrogen atom at the same time; b) R+□ and R11 each represent -CH, CH,OH base material,
0.01-0.5 weight percent of an overbased alkaline earth metal compound and the formula: %formula%] (wherein R4 represents a hydrocarbon group having 1 to 24 carbon atoms; iRs; A rust-inhibiting lubricating oil composition comprising a small amount of a substituted trialkanolamine in which Y2 and Z represent a hydrogen atom or a C1-C10 hydrocarbon group and xl represents O or 1 It has been described.

British Patent Publication No. 2172284A describes corrosion inhibitors of the formula: %Formula % [wherein X is inter alia 10-; R6 is inter alia an alkyl group having 2 to 6 carbon atoms; R7 is a monosubstituted 2 to 5 carbon atoms substituted with 1 to 4 alkyl groups or 1 to 3 hydroxyl groups;
represents an alkyl group; and R8 is a hydrogen atom, an unsubstituted C1-C4 alkyl group, or 1 or less, R7 and R1° do not simultaneously represent a hydrogen atom, and R1
゜ does not represent a pentyl group; and C) there are no co-additives of polyalkylene phenols or polycarboxylic esters.

subject to the conditions.

Each of these disclosures is concerned with the problem of providing durable corrosion protection of metal surfaces in contact with a functional liquid while the surfaces are in contact with the liquid.

Another problem that arises in the field of corrosion protection of metals is that the production of as-produced metals before being subjected to further permanent treatment or in contact with the final construction environment, e.g. functional fluids containing corrosion inhibitors. There is a need for temporary protection of metal surfaces.

U.S. Pat. No. 4,315,957 proposes using a wax composition as a temporary coating on metal and removing the wax coating with steam prior to further corrosion protection treatment of the metal.

U.S. Pat. No. 4,752,336 describes a method for applying a very thin, easily removable, temporary protective coating to metal surfaces, a process that is characterized by its properties in volatile fluorocarbon solvents. The solvent can be distilled off leaving a film of the ester on the metal surface. The ester self-evaporates (self-removes: 5e) from the surface within a predetermined time.
lf-re+noved).

SUMMARY OF THE INVENTION We have discovered a simple and effective method of providing temporary protection to metal surfaces.

The method involves simply immersing the metal surface to be treated in an environmentally acceptable organic solution of a corrosion inhibitor while avoiding volatilization of potentially hazardous fluorocarbon-based solvents.

The invention therefore provides: at least the formula I R-0-Clh-Ctl(Off)CH2N(CHzC
H20H)z (1) Represents a ru group and a tert-octadecyl group, or a mixture thereof. A preferred group for R is an alkyl group having 12 to 14 carbon atoms.

C8 -C15 alkyl R'' is, for example, n-
Octyl group, n-nonyl group, n-decyl group, n-dodecyl group, n-)lysosyl group, n-tetradecyl group, n-pentadecyl group, 1sO-octyl group, tert-octyl group, 1so-nonyl group, tert -nonyl group, 1so
-decyl group, tert-dodecyl group and jert-pentadecyl group or a mixture thereof. A preferred group for R'' is an alkyl group having 9 to 15 carbon atoms.

Preferred compounds of formula (1) are those in which R is a 4-nonylphenyl group, 4-dodecylphenyl group, 3-pentadecylphenyl group, dodecyl group or tetradecyl group, or a mixture thereof.

Organic solvents which may be used to form a solution of the compound of formula (1) are, for example, mineral oil, aromatic or aliphatic hydrocarbons or other petroleum solvents (wherein R has 12 carbon atoms).
a straight-chain or branched alkyl group having 8 to 20 carbon atoms, or a straight-chain or branched alkyl group having 8 to 15 carbon atoms, or a phenyl group of 3 or The metal surface to be protected is immersed in an environmentally acceptable organic medium containing at least one compound with a A method of providing temporary anti-corrosion protection to metal surfaces, especially ferrous metal surfaces, in contact with corrosive atmospheres, including removal from corrosive atmospheres.

Examples of the alkyl group R having 12 to 20 carbon atoms include n-dodecyl group, n-1-lysosyl group, n-tetradecyl group, n-hexadecyl group, n-octadecyl group, n-
-icosyl group, tert-dodecyl group, tert-hexadecyl group (petroleum 5pirit)
It is a solvent based on

The mineral oil is, for example, a paraffin oil such as paraffin oil with a viscosity of 46 mm2/s at 40°C;
)”, a refined solvent neutral mineral oil with a viscosity of 32 mm2/s at 40°C.
"Solvent Brightstox", which is a high-boiling residue obtained from the mineral oil refining process and has a viscosity of 46 mm"/s at 40°C.
ks)”.

The aromatic hydrocarbon medium is, for example, toluene or 0-l
It can be m- or p-xylene, trimethylbenzene or dodecylhenzene.

Aliphatic hydrocarbon media are, for example, n-decane or n-dodecane.

The compound of formula I is preferably dissolved in the organic medium in an amount ranging from 0 to 20% by weight, more preferably from 2 to 15% by weight, based on the total weight of the organic medium.

The compounds of formula I are known compounds, e.g.
172284A.

This process is used to prepare compounds of formula V: in which R has the meaning given above. ) or a salt thereof, such as a sodium salt or a potassium salt, in the absence or presence of a catalyst, with a compound of C) phosphorus-containing compounds, such as amine salts of phosphoric acid partial esters; d) sulfur-containing compounds, such as barium dinonylnaphthalene sulfonate and calcium petroleum sulfonate.

Examples of dispersing aids/surfactants are: polybutenylsuccinimide, polybutenylphosphonic acid derivatives, and basic magnesium, calcium and barium salts of sulfonic acids and magnesium, calcium and barium salts of phenols.

〔Example〕

The following examples further illustrate the invention.

1 Difference 1 ■'' Cold rolled steel panels (dimensions: 10102 x 152, thickness 20.8) were immersed in each test solution for several minutes, then removed, and the panels thus treated were drained. The process involves reacting the compound with diechnolamine at about 15 o'clock to obtain the reaction.

The organic medium may contain, in addition to the compounds of Part 2, other additives known to be useful in imparting temporary protection to metal surfaces, in particular other rust inhibitors and dispersing aids and/or interfacial agents. It may also contain an activator.

Examples of rust inhibitors are: a) organic acids, their esters, metal salts and acid anhydrides, such as N-oleoyl sarcosine, sorbitan mono-oleate, lead naphthenate, dodecenyl succinic anhydride, alkenyl succinic half esters (haHester
), 4-nonylphenoxyacetic acid; b) nitrogen-containing compounds, such as i) primary, secondary or tertiary aliphatic or cycloaliphatic amines and their amine salts of organic and inorganic acids, such as oil-soluble alkyl ammonium carbonates; and 11) heterocyclic compounds, such as substituted imidazurines.

Each specimen was then exposed to 5% at 35°C for 24 hours according to the method described in ASTM B117
Exposure to continuous saline spraying.

Each test solution was prepared using a petroleum base oil with the following physical properties as the solvent medium.

10.0 0.5 22.0
3.7% CA means aromatic carbon content.

After exposure to the salt spray for 2.4.6.8 and 24 hours, each panel was visually inspected for degree of rust and rated according to the scale below.

No rust detected.

20% of the panel is covered with rust.

40% of the panel is covered with rust.

60% of the panel is covered with rust.

80% of the panel is covered with rust.

100% of the panel is covered with rust.

Claims (1)

[Claims] (1) Formula I: R-O-CH_2-CH(OH)CH_2N(CH_2
CH_2OH)_2(I) [wherein, R has 1 carbon atom]
2 to 20 straight chain or branched alkyl groups, or formula II: ▲ Numerical formula, chemical formula, table, etc. ▼ (II) (wherein R^a is a straight chain or branched alkyl group having 8 to 15 carbon atoms; represents a branched alkyl group and is located in the 3 or 4 position of the phenyl group. A method of providing temporary anti-corrosion protection to a metal surface in contact with a corrosive atmosphere, comprising immersing the metal surface and then removing the metal surface from the medium. (2) The method according to claim (1), wherein the metal surface is a surface of ferrous metal. (3) The method according to claim 1, wherein R represents a dodecyl group, a tetradecyl group, a 4-nonylphenyl group, a 4-dodecylphenyl group, or a 3-pentadecylphenyl group. (4) A method according to claim 1, wherein the organic medium is a mineral oil, aromatic or aliphatic hydrocarbon or other petroleum spirit based solvent. 5. A method according to claim 1, wherein the compound of formula I is present in the organic medium in an amount ranging from 1 to 20% by weight, based on the weight of the organic medium. (6) 2 to 15% by weight based on the weight of the organic medium;
A method according to claim 5, wherein the compound of formula I is present in the organic medium in an amount in the range of . (7) The method according to claim 1, wherein the organic medium further contains a rust inhibitor and/or a dispersion aid and/or a surfactant. (8) A metal surface when temporarily protected by the method according to claim (1).